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  • 1. Aktas, Ozan
    et al.
    Ren, H.
    Runge, A. F. J.
    Peacock, A. C.
    Hawkins, T.
    Ballato, J.
    Gibson, Ursula J.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Interfacing telecom fibers and silicon core fibers with nano-spikes for in-fiber silicon devices2018In: 2018 Optical Fiber Communications Conference and Exposition, OFC 2018 - Proceedings, Institute of Electrical and Electronics Engineers Inc. (IEEE) , 2018, p. 1-3Conference paper (Refereed)
    Abstract [en]

    We report fabrication of tapered silicon core fibers with nano-spikes enabling efficient optical coupling into the core, as well as their seamless integration with single mode fibers. A proof-of-concept integrated in-fiber silicon device is demonstrated.

  • 2. Alcusa-Saez, E. P.
    et al.
    Diez, A.
    Rivera-Perez, E.
    Margulis, Walter
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Norin, Lars
    ACREO.
    Andres, M. V.
    Acousto-optic interaction in polyimide coated optical fibers with flexural waves2017In: Optics Express, E-ISSN 1094-4087, Vol. 25, no 15, p. 17167-17173Article in journal (Refereed)
    Abstract [en]

    Acousto-optic coupling in polyimide-coated single-mode optical fibers using flexural elastic waves is demonstrated. The effect of the polyimide coating on the acoustooptic interaction process is analyzed in detailed. Theoretical and experimental results are in good agreement. Although the elastic attenuation is significant, we show that acousto-optic coupling can be produced with a reasonably good efficiency. To our knowledge, it is the first experimental demonstration of acousto-optic coupling in optical fibers with robust protective coating.

  • 3. Alcusa-Saez, E. P.
    et al.
    Diez, A.
    Rivera-Perez, E.
    Margulis, Walter
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Norin, Lars
    Andres, M. V.
    All-fiber acousto-optic tunable filter in polyimide coated optical fibers2017In: 2017 19th International Conference on Transparent Optical Networks (ICTON), IEEE Computer Society, 2017, article id 8025093Conference paper (Refereed)
    Abstract [en]

    We present the experimental demonstration of in-fiber acousto-optic coupling in a polyimide-coated optical fiber. Although the presence of the polyimide coating increases is significantly the attenuation of the acoustic wave, we show that acousto-optic interaction can still be produced with reasonable efficiency. The effect of the polyimide coating on the acousto-optic interaction process is analyzed in detailed. Theoretical and experimental results are in good agreement. To our knowledge, this is the first experimental demonstration of acousto-optic coupling in optical fibers with robust protective coating.

  • 4. Al-Shammari, R. M.
    et al.
    Alattar, N.
    Manzo, Michele
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Gallo, Katia
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Rodriguez, B. J.
    Rice, J. H.
    Label-free cell membrane detection by Raman spectroscopy using biocompatible gold nanostructure microscale arrays on a ferroelectric template2017In: Optics InfoBase Conference Papers, OSA - The Optical Society , 2017Conference paper (Refereed)
  • 5.
    Amorebieta, Josu
    et al.
    Univ Basque Country, UPV EHU, Dept Commun Engn, Bilbao 48013, Spain..
    Pereira, Joao
    RISE Res Inst Sweden, Fiber Opt, S-16440 Stockholm, Sweden..
    Durana, Gaizka
    Univ Basque Country, UPV EHU, Dept Commun Engn, Bilbao 48013, Spain..
    Franciscangelis, Carolina
    RISE Res Inst Sweden, Fiber Opt, S-16440 Stockholm, Sweden..
    Ortega-Gomez, Angel
    Univ Basque Country, UPV EHU, Dept Commun Engn, Bilbao 48013, Spain..
    Zubia, Joseba
    Univ Basque Country, UPV EHU, Dept Commun Engn, Bilbao 48013, Spain..
    Villatoro, Joel
    Univ Basque Country, UPV EHU, Dept Commun Engn, Bilbao 48013, Spain.;Basque Fdn Sci, Ikerbasque, Bilbao 48011, Spain..
    Margulis, Walter
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics. RISE Res Inst Sweden, Fiber Opt, S-16440 Stockholm.
    Twin-core fiber sensor integrated in laser cavity2022In: Scientific Reports, E-ISSN 2045-2322, Vol. 12, no 1, article id 11797Article in journal (Refereed)
    Abstract [en]

    In this work, we report on a twin-core fiber sensor system that provides improved spectral efficiency, allows for multiplexing and gives low level of crosstalk. Pieces of the referred strongly coupled multicore fiber are used as sensors in a laser cavity incorporating a pulsed semiconductor optical amplifier (SOA). Each sensor has its unique cavity length and can be addressed individually by electrically matching the periodic gating of the SOA to the sensor's cavity roundtrip time. The interrogator acts as a laser and provides a narrow spectrum with high signal-to-noise ratio. Furthermore, it allows distinguishing the response of individual sensors even in the case of overlapping spectra. Potentially, the number of interrogated sensors can be increased significantly, which is an appealing feature for multipoint sensing.

  • 6. Araujo, L. F.
    et al.
    Etcheverry, Sebastián
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics. Dept. Fiber Optics, RISE Acreo AB, Electrum 236, Stockholm, 16440, Sweden.
    Pereira, Joao
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics. Dept. Fiber Optics, RISE Acreo AB, Electrum 236, Stockholm, 16440, Sweden.
    Margulis, Walter
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics. Dept. Fiber Optics, RISE Acreo AB, Electrum 236, Stockholm, 16440, Sweden.
    Fontana, J.
    Carvalho, I. C. S.
    In-fiber optofluidic alignment of Au-nanorods2017In: Proceedings of SPIE - The International Society for Optical Engineering, SPIE , 2017, p. 132-133Conference paper (Refereed)
    Abstract [en]

    Optofluidic all-fiber devices are used for orientation of Au-nanorods under strongelectric fields. The dynamics is studied on sub-microsecond time-scales. A two-level laser rateequation model allows inferring diffusion rate, rotational mobility and other parameters.

  • 7. Armougom, J.
    et al.
    Melkonian, J. -M
    Dherbercourt, J. -B
    Raybaut, M.
    Godard, A.
    Coetzee, Riaan
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    70 mJ single-frequency parametric source tunable between 1.87-1.93 μm and 2.37-2.47 μm for difference frequency generation in the LWIR2017In: Optics InfoBase Conference Papers, OSA - The Optical Society , 2017Conference paper (Refereed)
  • 8. Armougom, J.
    et al.
    Melkonian, J. -M
    Raybaut, M.
    Dherbecourt, J. -B
    Godard, A.
    Cezard, N.
    Coetzee, Riaan Stuart
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Kadlcˇák, J.
    Standoff detection of hazardous chemicals using a longwave infrared parametric source2018In: Optics InfoBase Conference Papers, OSA - The Optical Society , 2018Conference paper (Refereed)
    Abstract [en]

    We report on a new longwave infrared optical parametric source, and its implementation for long range or medium range standoff detection of gaseous chemical warfare agents.

  • 9.
    Armougom, J.
    et al.
    France.
    Melkonian, J. -M
    France.
    Raybaut, M.
    France.
    Dherbecourt, J. -B
    France.
    Gorju, G.
    France.
    Godard, A.
    France.
    Coetzee, Riaan Stuart
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Physics. KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Kadlcák, J.
    Czech republic.
    Longwave infrared lidar based on parametric sources for standoffdetection of gaseous chemicals2018In: Optics InfoBase Conference Papers, Optical Society of America, 2018Conference paper (Refereed)
    Abstract [en]

    We report on a longwave infrared lidar, tailored for detection of chemical warfare agents in the gaseous phase. The emitter is based on single-frequency 2 μm parametric oscillator/amplifier systems followed by a ZnGeP2 downconversion stage.

  • 10. Arvidsson, G.
    et al.
    Henriksson, P.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Passive polymer waveguides1994Conference paper (Refereed)
  • 11. Arvidsson, G.
    et al.
    Karlsson, H.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Periodic poling of crystals from the KTP family1997Conference paper (Refereed)
  • 12. Arvidsson, G.
    et al.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Quasi-phasematched nonlinear optical interactions inferroelectric crystals1994Conference paper (Refereed)
  • 13. Arvidsson, G.
    et al.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Second-harmonic generation in channel waveguidesfabricated by titanium diffusion in magnesium doped lithium niobate1987Conference paper (Refereed)
  • 14. Arvidsson, G.
    et al.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Titanium diffused lithium niobate waveguides forwavelength conversion based on nonlinear optical interaction1984Conference paper (Refereed)
  • 15. Arvidsson, G.
    et al.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Jaskorzynska, B.
    Webjörn, J.
    Loni, A.
    Keys, R. W.
    De La Rue, R. M.
    Influence of annealing on the conversion efficiency forSHG by Cerenkov radiation from proton-exchanged LiNbO3 waveguides1989Conference paper (Refereed)
  • 16. Arvidsson, G.
    et al.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Webjörn, .
    Compact light sources based on frequencyconversion in lithium niobate and other nonlinear optical crystals1993Conference paper (Refereed)
  • 17. Arvidsson, G.
    et al.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Webjörn, J.
    Åhlfeldt, H.
    Methods to fabricate periodically domain-invertedstructures in ferroelectric crystals1994Conference paper (Refereed)
  • 18. Arvidsson, G.
    et al.
    Sjöberg, A.
    Lipovsky, A. A.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Titanium-diffused  waveguides in magnesium-dopedlithium niobate for nonlinear frequency conversion1989Conference paper (Refereed)
  • 19. Arvidsson, M.
    et al.
    Hansson, B.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Lindström, C.
    Olsson, M.
    A pulse stabilized micro-chip laser1996Conference paper (Refereed)
  • 20. Bach, F.
    et al.
    Mero, M.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Petrov, V.
    High repetition rate, femtosecond and picosecond laser induced damage thresholds of Rb: KTiOPO4 at 1.03 μm2014In: Optics InfoBase Conference Papers, OSA - The Optical Society , 2014Conference paper (Refereed)
    Abstract [en]

    Laser-induced damage threshold (LIDT) measurements were performed on blank, uncoated Rb:KTiOPO4 (RKTP) samples at 1.03 μm with pulse durations of 330 and 930 fs and a repetition rate of 100 kHz, including temperature dependence.

  • 21.
    Bach, Florian
    et al.
    Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Str. 2a, Berlin, 12489, Germany.
    Mero, Mark
    Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Str. 2a, Berlin, 12489, Germany.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Petrov, Valentin
    Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Str. 2a, Berlin, 12489, Germany.
    High repetition rate, femtosecond and picosecond laser induced damage thresholds of Rb: KTiOPO4 at 1.03 μm2016In: Laser Applications Conference, LAC 2016, Optica Publishing Group , 2016Conference paper (Refereed)
    Abstract [en]

    Laser-induced damage threshold (LIDT) measurements were performed on blank, uncoated Rb:KTiOPO4 (RKTP) samples at 1.03 μm with pulse durations of 330 and 930 fs and a repetition rate of 100 kHz, including temperature dependence.

  • 22. Bach, Florian
    et al.
    Mero, Mark
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Petrov, Valentin
    High repetition rate, femtosecond and picosecond laser induced damage thresholds of Rb:KTiOPO4 at 1.03 mu m2017In: Optical Materials Express, ISSN 2159-3930, E-ISSN 2159-3930, Vol. 7, no 3, p. 744-750Article in journal (Refereed)
    Abstract [en]

    A laser-induced damage study is performed on blank, uncoated Rb:KTiOPO4 (RKTP) samples at 1.03 mu m with two different pulse durations of similar to 0.3 and similar to 1.0 ps and a repetition rate of 100 kHz. The effect of the sample temperature is also considered.

  • 23. Baek, In Hyung
    et al.
    Choi, Sun Young
    Lee, Hwang Woon
    Cho, Won Bae
    Petrov, Valentin
    Agnesi, Antonio
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Yeom, Dong-Il
    Kim, Kihong
    Rotermund, Fabian
    Single-walled carbon nanotube saturable absorber assisted high-power mode-locking of a Ti:sapphire laser2011In: Optics Express, E-ISSN 1094-4087, Vol. 19, no 8, p. 7833-7838Article in journal (Refereed)
    Abstract [en]

    We report on passive mode-locking of a Ti:sapphire laser employing a single-walled carbon nanotube saturable absorber (SWCNT-SA) specially designed and fabricated for wavelengths near 800 nm. Mode-locked pulses as short as 62 fs were generated at a repetition rate of 99.4 MHz. We achieved output powers from the SWCNT-SA mode-locked laser as high as 600 mW with a slope efficiency of 26%. The characteristics of SWCNT-SA-assisted mode-locking were compared with those of Kerr-lens mode-locking without SWCNT-SA.

  • 24.
    Baghban, Mohammad Amin
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum and Biophotonics.
    Swillo, Marcin
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Gallo, Katia
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Second-Harmonic generation engineering in lithium niobate nanopillars2019In: Proceedings 2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference, CLEO/Europe-EQEC 2015, Optical Society of America (OSA) , 2019Conference paper (Refereed)
  • 25.
    Barbosa Pereira, Joao Manoel
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Optically poled fibers for electro-optic applications2022Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The work presented in this thesis shows the development of optically poleddevices for use in electro-optic experiments. In the form of papers published,it describes three optical poling methods: green light poling (Paper I), poling with a UV lamp (Paper II), and corona discharge poling (Paper V).Applications using the poled components are studied in distributed sensingby exploring Rayleigh scattering in poled fibers (Paper III), intermodal interference in poled fibers (Paper IV), and FBG inscribed in poled fibers forvoltage sensing (Paper VI).In thermal poling, heat increases the mobility of added ions to the fiber.An external electric field displaces the charges creating a depletion regionclose to the anode, where the fiber core is usually positioned. The proximityof the metal electrode to the core can cause optical losses, making electrooptic applications less efficient. The need for additional dopant in the preformcan make the production of these devices expensive.Optical poling explores the presence of Ge E’ centers in the fiber core torelease charges after light excitation. These centers are already present in anyfiber with Ge in the core. This enables the development of a fiber for opticalpoling very similar to a standard telecom fiber, making it cheaper and easyto integrate with standard components. Optical poling does not rely on theformation of a depleted region in the cladding, and the core can be positionedfar from the metal electrodes. This advantage allows low-loss electro-opticcomponents to be fabricated.Optical poling is usually thought to have lower induced effects when compared with thermal poling. In this work, experiments with optical polingwere made to study the possibility of increasing the induced second-ordernonlinearities to a level comparable with thermal poling.The fabricated poled fibers were used to investigate their potential usein fiber sensing. The emphasis was to explore new technologies such as CPϕOTDR, few-mode fiber sensing, which gained attention in the latest years,and FBGs, which is a mature technology.The results presented in the Papers I-VI show the advances and potentialapplications explored. 

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  • 26.
    Barrett, Laura
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Lee, Cherrie
    KTH, School of Engineering Sciences (SCI), Applied Physics, Biomedical and X-ray Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Biomedical and X-ray Physics.
    High-contrast coercive field engineering for periodic poling of RbKTiOPO4 with Ba2+/K+ ion-exchange2024In: Optics Express, E-ISSN 1094-4087, Vol. 32, no 8, p. 14252-14260Article in journal (Refereed)
    Abstract [en]

    We investigate a new method of coercive field engineering for periodic poling of RbKTiOPO4 (RKTP). By ion exchanging RKTP in a molten salt containing 7 mol% Ba(NO3)2 and 93 mol% KNO3 we achieve more than an order of magnitude difference in polarization switching time between the exchanged and non-exchanged regions. This method is used to fabricate periodic gratings of 2.92 µm in 1 mm thick bulk RKTP for second harmonic generation at 779 nm with a normalized conversion efficiency of 2%/Wcm. We show that the poled domain structures are stable at 300 °C, and that there is no bulk refractive index modification associated with the periodic ion exchange.

  • 27.
    Barrett, Laura
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Biomedical and X-ray Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Biomedical and X-ray Physics.
    Novel Coercive Field Engineering Method for Short Period KTiOPO42023In: 2023 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2023, Institute of Electrical and Electronics Engineers (IEEE) , 2023Conference paper (Refereed)
    Abstract [en]

    The development of reliable periodic poling methods that allow for sub-µm quasi-phase matched (QPM) gratings and, at the same time, allow for waveguide implementation, is of paramount importance for a large number of applications. For instance, backward-wave optical parametric oscillators [1] are only viable if the QPM period is on the same order of magnitude as the wavelengths of the interacting waves. Furthermore, the integration of such QPM devices in a waveguide format would unveil countless possibilities in quantum optics employing the crystal as an ultrabright bi-photon source with unique spectral characteristics.

  • 28.
    Bayraktar, Ömer
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Swillo, Marcin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum Electronics and Quantum Optics, QEO.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Björk, Gunnar
    KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum Electronics and Quantum Optics, QEO.
    Quantum-polarization state tomography2016In: PHYSICAL REVIEW A, ISSN 2469-9926, Vol. 94, no 2, article id 020105Article in journal (Refereed)
    Abstract [en]

    We propose and demonstrate a method for quantum-state tomography of qudits encoded in the quantum polarization of N-photon states. This is achieved by distributing N photons nondeterministically into three paths and their subsequent projection, which for N = 1 is equivalent to measuring the Stokes (or Pauli) operators. The statistics of the recorded N-fold coincidences determines the unknown N-photon polarization state uniquely. The proposed, fixed setup manifestly rules out any systematic measurement errors due to moving components and allows for simple switching between tomography of different states, which makes it ideal for adaptive tomography schemes.

  • 29. Bertani, Stefano
    et al.
    Jacobsson, Bjorn
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Stjernström, Mårten
    KTH, School of Chemical Science and Engineering (CHE), Chemistry, Analytical Chemistry.
    Stretching-tunable external-cavity laser locked by an elastic silicone grating2006In: Optics Express, E-ISSN 1094-4087, Vol. 14, no 25, p. 11982-11986Article in journal (Refereed)
    Abstract [en]

    We demonstrate wavelength locking of a diode laser at 760 nm with feedback from an elastic transmission grating in the Littrow configuration. The laser was in a single longitudinal mode with a side-mode suppression of 20 dB. By stretching the grating the laser could be tuned over a few nm. The grating was fabricated in a silicone elastomer ( polydimethylsiloxane) by a moulding technique, and coated by a thin layer of Ti and Au to achieve an increased diffraction efficiency needed for efficient locking.

  • 30.
    Bjurshagen, Stefan
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Hellström, Jonas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pujol, Maria
    Fisica I Cristal-Lografia de Materials (FiCMA), Universitat Rovira I Virgili, Spain.
    Aguiló, Magdalena
    Fisica I Cristal-Lografia de Materials (FiCMA), Universitat Rovira I Virgili, Spain.
    Díaz, Francesc
    Fisica I Cristal-Lografia de Materials (FiCMA), Universitat Rovira I Virgili, Spain.
    Fluorescence dynamics and rate equations analysis in Er3+,Yb3+ doped double tungstates2006In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 45, no 19, p. 4715-4725Article in journal (Refereed)
    Abstract [en]

    The fluorescence dynamics in Er3+ and Yb3+ doped KGd(WO4)(2) and KY(WO4)(2) has been investigated. Lifetimes have been measured for the Yb(F-2(5/2)), Er(I-4(13/2)), and Er(S-4(3/2)) levels around 1, 1.5, and 0.55 mu m, respectively. The Yb(F-2(5/2)) lifetimes show a decreasing trend toward the limiting Er(I-4(11/2)) lifetime with increasing Er-to-Yb concentration ratio, whereas the Er(I-4(13/2)) lifetimes are mostly unaffected by the doping concentrations. A rate equation analysis has been performed to explain the observed behavior and gain is calculated for a continuous-wave laser at 1.53 mu m to find the optimum doping concentrations for high gain.

  • 31.
    Bjurshagen, Stefan
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Parreu, I.
    University of Tarragona.
    Pujol, M. C.
    University of Tarragona.
    Aguiló, M.
    University of Tarragona.
    Diaz, Francesc
    University of Tarragona.
    Crystal Growth, Spectroscopic Characterisation and Eye-Safe Laser Operation of Er and Yb Doped KLu(WO4)22008Conference paper (Refereed)
    Abstract [en]

    High quality Er:Yb:KLu(WO4)2have been grown using TSSG method and spectroscopically investigated . The laser performance is compared with that in Er:Yb:KY(WO4)2. Role of upconversion processes and optimum doping concentrations have been estimated.

  • 32. Bode, M.
    et al.
    Freitag, I.
    Spiekermann, S.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Ultra-violet single frequency pulses with high averagepower using frequency converted passively Q-switched quasi-monolithic Nd:YAGring lasers2001Conference paper (Refereed)
  • 33. Bolanos, Western
    et al.
    Carvajal, Joan J.
    Mateos, Xavier
    Cinta Pujol, Maria
    Thilmann, Nicky
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Lifante, Gines
    Aguilo, Magdalena
    Diaz, Francesc
    Epitaxial layers of KY1-x-yGdxLuy(WO4)(2) doped with Er3+ and Tm3+ for planar waveguide lasers2010In: Optical materials (Amsterdam), ISSN 0925-3467, E-ISSN 1873-1252, Vol. 32, no 3, p. 469-474Article in journal (Refereed)
    Abstract [en]

    Here we show the results we obtained in the fabrication of planar wave guide lasers based on monoclinic double tungstates doped with Er3+ and Tm3+. We have successfully introduced these ions into the lattice matched KY0.59Gd0.19Lu0.22(WO4)(2) epitaxial layers grown on KY(WO4)(2) substrates without loss of optical quality and keeping a high refractive index contrast between the epitaxial layer and the substrate. We characterized the waveguiding properties of these epitaxial layers at lambda = 632.8 nm by dark modes spectroscopy, and we showed that these waveguides can support several TE and TM modes. Spectroscopic characterization of the active lanthanide ions in these crystals is also presented.

  • 34. Bolaños, W.
    et al.
    Carvajal, J.J.
    Mateos, X.
    Pujol, M.C.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Thilmann, Nicky
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Aguiló, M.
    Díaz, F.
    Fabrication and characterization of epitaxial layers of the KY1-x-yGdxLuy(WO4)2 system for waveguide lasers2009Conference paper (Refereed)
  • 35. Boudrioua, A.
    et al.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Moretti, P.
    Loulerque, C.
    Depth dependence of the second harmonic generationof ion implanted waveguides2000Conference paper (Refereed)
  • 36. Boyko, A. A.
    et al.
    Kostyukova, N. Y.
    Badikov, V.
    Badikov, D.
    Panyutin, V.
    Shevyrdyaeva, G.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Marchev, G. M.
    Kolker, D. B.
    Petrov, V.
    Intracavity difference-frequency mixing of OPO signal and idler pulses in BaGa4Se72017In: Optics InfoBase Conference Papers, Optical Society of America, 2017, Vol. Part F41Conference paper (Refereed)
    Abstract [en]

    An overall quantum conversion efficiency of 7.8% is achieved by intracavity mixing the signal and idler of a 1.064-μm pumped Rb:PPKTP OPO in BaGa4Se7, generating >0.7 mJ pulse energy at ~7 μm and 100 Hz.

  • 37. Boyko, A. A.
    et al.
    Marchev, G. M.
    Petrov, V.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Kolker, D. B.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Kostyukova, N. Y.
    Intracavity-pumped, cascaded AgGaSe2 optical parametric oscillator tunable up to 18 μm2016In: Optics InfoBase Conference Papers, Optica Publishing Group , 2016Conference paper (Refereed)
    Abstract [en]

    We report on a AgGaSe2 optical parametric oscillator (OPO), intracavity pumped by the 1.85-μm signal pulses of a 1.064-μm pumped Rb:PPKTP OPO. It operates at 100 Hz with idler tunability from ~8 to 18 μm. 

  • 38. Boyko, A. A.
    et al.
    Marchev, G. M.
    Petrov, V.
    Pasiskevicius, Valdus
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Kolker, D. B.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Kostyukova, N. Y.
    Intracavity-pumped, cascaded Mid-IR optical parametric oscillator based on AgGaSe22015In: Advanced Solid State Lasers, ASSL 2015, Optical Society of America, 2015Conference paper (Refereed)
    Abstract [en]

    We report on an AgGaSe2 optical parametric oscillator (OPO), intracavity pumped by the 1.85-μm signal pulses from a 1.064-μm pumped Rb:PPKTP OPO. It operates at 100 Hz with idler tunability from 5.8 to 8.3 μm.

  • 39. Boyko, A.
    et al.
    Kostyukova, N.
    Guha, S.
    Schunemann, P. G.
    Marchev, G.
    Panyutin, V.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Kolker, D.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Petrov, V.
    Rb: PPKTP optical parametric oscillator with intracavity difference- frequency generation in temperature-tuned OPGaAs2017In: Optics InfoBase Conference Papers, OSA - The Optical Society , 2017Conference paper (Refereed)
  • 40. Boyko, Andrey A.
    et al.
    Kostyukova, Nadezhda Y.
    Badikov, Valeriy
    Badikov, Dmitrii
    Panyutin, Vladimir
    Shevyrdyaeva, Galina
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Marchev, Georgi M.
    Kolker, Dmitry B.
    Petrov, Valentin
    Intracavity difference-frequency mixing of optical parametric oscillator signal and idler pulses in BaGa4Se72017In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 56, no 10, p. 2783-2786Article in journal (Refereed)
    Abstract [en]

    An overall quantum conversion efficiency of 7.8% is achieved by intracavity mixing the signal and idler of a 1.064 mu m pumped Rb: PPKTP optical parametric oscillator in BaGa4Se7. In this way, a pulse energy of similar to 0.71 mJ is generated at similar to 7 mu m for a repetition rate of 100 Hz. Tuning of the mid-IR radiation is demonstrated by heating of the Rb: PPKTP crystal.

  • 41. Boyko, Andrey A.
    et al.
    Kostyukova, Nadezhda Y.
    Marchev, Georgi M.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Kolker, Dmitry B.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Petrov, Valentin
    Rb:PPKTP optical parametric oscillator with intracavity difference-frequency generation in AgGaSe22016In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 41, no 12, p. 2791-2794Article in journal (Refereed)
    Abstract [en]

    A 1.064 mu m pumped Rb:PPKTP optical parametric oscillator (OPO) generates mid-IR radiation by intracavity mixing the resonant signal and idler waves in AgGaSe2. The similar to 6 ns pulses at similar to 7 mu m have an energy of 670 mu J at 100 Hz, equivalent to an average power of 67 mW. The overall quantum conversion efficiency from 1.064 mu m amounts to 8%, and the power conversion efficiency is 1.2%.

  • 42.
    Boyko, Andrey A.
    et al.
    Max-Born-Institute for Nonlinear Optics and Ultrafast Spectroscopy, 2A Max-Born-Str., D-12489 Berlin, Germany, 2A Max-Born-Str.; Special Technologies, Ltd., 1/3 Zeljonaja gorka Str., 630060 Novosibirsk, Russia, 1/3 Zeljonaja gorka Str.; Research Laboratory of Quantum Optics Technology, Novosibirsk State University, 2 Pirogova Str., 630090 Novosibirsk, Russia, 2 Pirogova Str..
    Marchev, Georgi M.
    Max-Born-Institute for Nonlinear Optics and Ultrafast Spectroscopy, 2A Max-Born-Str., D-12489 Berlin, Germany, 2A Max-Born-Str..
    Petrov, Valentin
    Max-Born-Institute for Nonlinear Optics and Ultrafast Spectroscopy, 2A Max-Born-Str., D-12489 Berlin, Germany, 2A Max-Born-Str..
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Kolker, Dmitry B.
    Research Laboratory of Quantum Optics Technology, Novosibirsk State University, 2 Pirogova Str., 630090 Novosibirsk, Russia, 2 Pirogova Str..
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Kostyukova, Nadezhda Y.
    Max-Born-Institute for Nonlinear Optics and Ultrafast Spectroscopy, 2A Max-Born-Str., D-12489 Berlin, Germany, 2A Max-Born-Str.; Special Technologies, Ltd., 1/3 Zeljonaja gorka Str., 630060 Novosibirsk, Russia, 1/3 Zeljonaja gorka Str.; Research Laboratory of Quantum Optics Technology, Novosibirsk State University, 2 Pirogova Str., 630090 Novosibirsk, Russia, 2 Pirogova Str..
    Intracavity-Pumped, Cascaded AgGaSe2Optical Parametric Oscillator Tunable up to 18 μm2016In: Mid-Infrared Coherent Sources, MICS 2016, Optica Publishing Group , 2016, article id MS4C.4Conference paper (Refereed)
    Abstract [en]

    We report on a AgGaSe2 optical parametric oscillator (OPO), intracavity pumped by the 1.85-μm signal pulses of a 1.064-μm pumped Rb:PPKTP OPO. It operates at 100 Hz with idler tunability from ∼8 to 18 μm.

  • 43.
    Boyko, Andrey A.
    et al.
    Max Born Inst Nonlinear Opt & Ultrafast Spect, Max Born Str 2a, D-12489 Berlin, Germany.;Novosibirsk State Univ, 2 Pirogova Str, Novosibirsk 630090, Russia.;Tomsk State Univ, 36 Lenin Ave, Tomsk 634050, Russia..
    Wang, Li
    Max Born Inst Nonlinear Opt & Ultrafast Spect, Max Born Str 2a, D-12489 Berlin, Germany..
    Mhibik, Oussama
    Univ Cent Florida, Coll Opt & Photon, CREOL, Orlando, FL 32816 USA..
    Divliansky, Ivan B.
    Univ Cent Florida, Coll Opt & Photon, CREOL, Orlando, FL 32816 USA..
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Mølster, Kjell Martin
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Chen, Weidong
    Glebov, Leonid B.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Petrov, Valentin
    High-energy, narrowband, non-resonant PPKTP optical parametric oscillator2022In: Nonlinear Frequency Generation and Conversion: Materials and Devices XXI / [ed] Schunemann, PG Petrov, V, SPIE - International Society for Optical Engineering, 2022, Vol. 11985, article id 119850GConference paper (Refereed)
    Abstract [en]

    We present a narrowband, non-resonant optical parametric oscillator based on 5-mm thick Rb-doped periodically-poled KTiOPO4 (PPKTP) operating in the high-energy/low repetition-rate regime. An uncoated volume Bragg grating (VBG) is employed as one of the cavity mirrors reflecting only the signal whereas the other cavity mirror is reflecting only the idler. Pumping by a Nd:YAG laser at 1.0642 mu m in a double-pass, the signal plus idler output energy reached almost 5 mJ at a repetition rate of 100 Hz corresponding to a conversion efficiency of similar to 26%. Both signal and idler are narrowband with full width at half maximum (FWHM) of 0.5 nm at 1942 nm and 0.76 nm at 2355 nm, respectively.

  • 44.
    Brunzell, Martin
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics. Royal Inst Technol, Dept Appl Phys, Roslagstullsbacken 21, S-10691 Stockholm, Sweden..
    Widarsson, Max
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Krook, Christoffer
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Barrett, Laura
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Intra-cavity dark pulse generation through synchronized sum-frequency mixing2022In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 47, no 5, p. 1105-1108Article in journal (Refereed)
    Abstract [en]

    A Nd:YVO4 laser operating at 1064 nm generating a stable mode-locked train of 10 ps-long dark pulses with a 211 MHz repetition rate is presented. The mode-locking relies on a periodic loss modulation produced by intra-cavity sum-frequency mixing with a synchronous bright-pulse train from a mode-locked femtosecond Yb:KYW laser at 1040 nm. A modulation depth of 9050 was achieved for the dark pulses, confirmed by cross-correlation measurements. The ultrafast loss modulation injects power into the Nd:YVO4 laser cavity modes beyond the laser gain bandwidth. At proper laser cavity length, the detuning interaction of these modes with the lasing modes leads to the generation of periodic ultra-fast transients at frequencies above 1.5 THz.

  • 45.
    Brunzell, Martin
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Widarsson, Max
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Free-Space Intra-Cavity Dark Pulse Generation2021In: 2021 Conference On Lasers And Electro-Optics Europe & European Quantum Electronics Conference (CLEO/EUROPE-EQEC), Institute of Electrical and Electronics Engineers (IEEE) , 2021Conference paper (Refereed)
  • 46.
    Brunzell, Martin
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Widarsson, Max
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Free-Space intra-cavity dark pulse generation2021In: Optics InfoBase Conference Papers, Optica Publishing Group , 2021Conference paper (Refereed)
  • 47. Budriunas, R.
    et al.
    Kucˇinskas, D.
    Stanislauskas, T.
    Gadonas, D.
    Viotti, Anne-Lise
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Varanavicˇius, A.
    Broadband noncollinear optical parametric amplification in GaSe pumped at 1.5μm2018In: Optics InfoBase Conference Papers, OSA - The Optical Society , 2018Conference paper (Refereed)
    Abstract [en]

    We demonstrate broadband parametric amplification in GaSe crystal in noncollinear geometry. Seed pulses spanning 1.5-2.6μm are produced by cascaded χ(2) nonlinearity in a periodically poled Rb:KTP crystal. Amplified pulse bandwidths supporting 10-15fs transformlimited pulse durations at ~2μm central wavelength are achieved.

  • 48. Camara, Alexandre R.
    et al.
    Pereira, Joao M. B.
    Tarasenko, Oleksandr
    Margulis, Walter
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics. Fiber Optic Department, Acreo Swedish ICT, Electrum 236, 164 40 Kista, Sweden.
    Carvalho, Isabel C. S.
    Departamento de Física, Pontifícia Universidade Católica Do Rio de Janeiro, Rua Marquês de São Vicente 225, Gávea, 22451-900, Rio de Janeiro, Brazil.
    Optical creation and erasure of the linear electrooptical effect in silica fiber2015In: Optics Express, E-ISSN 1094-4087, Vol. 23, no 14, p. 18060-18069Article in journal (Refereed)
    Abstract [en]

    We study the creation and erasure of the linear electrooptical effect in silicate fibers by optical poling. Carriers are released by exposure to green light and displaced with simultaneous application of an internal dc field. The second order nonlinear coefficient induced grows with poling bias. The field recorded (similar to 10(8) V/m) is comparable to that obtained through classical thermal poling of fibers. In the regime studied here, the second-order nonlinearity induced (similar to 0.06 pm/V) is limited by the field applied during poling (1.2 x 10(8) V/m). Optical erasure with high-power green light alone is very efficient. The dynamics of the writing and erasing process is discussed, and the two dimensional (2D) field distribution across the fiber is simulated. (C) 2015 Optical Society of America

  • 49. Campbell, S.
    et al.
    Thomson, R. R.
    Hand, D. P.
    Kar, A. K.
    Reid, D. T.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Frequency doubling in femtosecond-written periodically-poled potassium titanyl phosphate waveguides2007In: Conference on Lasers and Electro-Optics, 2007, CLEO 2007, 2007, p. 4452462-Conference paper (Refereed)
    Abstract [en]

    Frequency doubling is demonstrated in femtosecond-laser-created single-mode waveguides written in a periodically-poled potassium titanyl phosphate crystal. Conversion efficiencies of 0.22%/W (0.02%/W) were obtained for first (third) order phasematching at 980nm (800nm).

  • 50. Campbell, S.
    et al.
    Thomson, R. R.
    Hand, D. P.
    Kar, A. K.
    Reid, D. T.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Frequency doubling in femtosecond-written periodically-poled potassium titanyl phosphate waveguides2007In: Lasers and Electro-Optics, 2007 European Conference on and the International Quantum Electronics Conference, 2007, p. 4386106-Conference paper (Refereed)
    Abstract [en]

    The second-harmonic conversion efficiency within the PPKTP waveguide is investigated using two separate tunable CW Ti:sapphire lasers at 800 nm and 980 nm. Results show strong conversion efficiency which imply that the local damage-induced index modification does not adversely affect the periodic domain structure in the material.

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