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Publications (10 of 648) Show all publications
Yang, X., Lindberg, R., Larsson, J., Bood, J., Brydegaard, M. & Laurell, F. (2019). 1.57 mu m fiber source for atmospheric CO2 continuous-wave differential absorption lidar. Optics Express, 27(7), 10304-10310
Open this publication in new window or tab >>1.57 mu m fiber source for atmospheric CO2 continuous-wave differential absorption lidar
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2019 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 27, no 7, p. 10304-10310Article in journal (Refereed) Published
Abstract [en]

We present an efficient fiber source designed for continuous-wave differential absorption light detection and ranging (CW DIAL) of atmospheric CO2-concentration. It has a linewidth of 3 MHz, a tuning range of 2 nm over the CO2 absorption peaks at 1.572 mu m, and an output power of 1.3 W limited by available pump power. Results from the initial CW DIAL testing are also presented and discussed. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Place, publisher, year, edition, pages
Optical Society of America, 2019
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-252406 (URN)10.1364/OE.27.010304 (DOI)000466708200089 ()31045174 (PubMedID)2-s2.0-85064391580 (Scopus ID)
Note

QC 20190605

Available from: 2019-06-05 Created: 2019-06-05 Last updated: 2019-06-12Bibliographically approved
Kores, C. C., Ismail, N., Bernhardi, E. H., Laurell, F. & Pollnau, M. (2019). Accumulation of Distributed Phase Shift in Distributed-Feedback Resonators. IEEE Photonics Journal, 11(1), Article ID 1500109.
Open this publication in new window or tab >>Accumulation of Distributed Phase Shift in Distributed-Feedback Resonators
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2019 (English)In: IEEE Photonics Journal, ISSN 1097-5764, E-ISSN 1943-0655, Vol. 11, no 1, article id 1500109Article in journal (Refereed) Published
Abstract [en]

Distributed-feedback waveguide lasers based on Bragg-grating resonators generate ultranarrow-linewidth emission. Oscillation at the center of the reflection band ensures maximum reflectivity, hence minimum linewidth. The required pi/2 phase shift is often introduced by a distributed change in effective refractive index, e.g., by widening the waveguide. Despite careful design and fabrication, the experimentally observed resonance wavelength deviates from the designed wavelength. Even when thermally induced chirp or fabrication errors are negligible, this deviation is still present. Here, we show theoretically and experimentally that this deviation is of fundamental nature. The decay of light intensity during propagation from the phase-shift center into both sides of the Bragg grating due to reflection by the periodic grating and the refractive index change causes an incomplete accumulation of designed phase shift, thereby systematically shifting the resonance to a shorter wavelength. Considering the overlap integral between the distributed phase shift and light intensity in the design provides the desired performance.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2019
Keywords
Distributed-feedback lasers, optical resonators, laser resonators, Bragg reflectors
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-241302 (URN)10.1109/JPHOT.2018.2886073 (DOI)000454978600001 ()2-s2.0-85058663553 (Scopus ID)
Note

QC 20190128

Available from: 2019-01-28 Created: 2019-01-28 Last updated: 2019-12-20Bibliographically approved
Yang, X., Larsson, J., Lindberg, R., Xu, C., Brydegaard, M. & Laurell, F. (2019). Atmospheric CO2-detection via Scheimpflug DIAL Employing a Simple Fiber Amplifier. In: : . Paper presented at 2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference.
Open this publication in new window or tab >>Atmospheric CO2-detection via Scheimpflug DIAL Employing a Simple Fiber Amplifier
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2019 (English)Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

The ever-increasing worldwide environmental awareness has prompted much effort to minimize humanity’s ecological footprint. This has led to increased demands for reliable technologies for assessing the current situation as well as the efficiency of new policies and interventions. In particular, CO2-monitoring has attracted lots of attention as CO2 is the greenhouse gas that is emitted in the largest quantities.

National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-265647 (URN)
Conference
2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference
Note

QC 20191219

Available from: 2019-12-18 Created: 2019-12-18 Last updated: 2019-12-19Bibliographically approved
Tjörnhammar, S., Maestroni, V., Uždavinys, T. K., Zukauskas, A., Canalias, C., Pasiskevicius, V. & Laurell, F. (2019). Blue light induced infrared absorption and color-center fluorescence in KTP isomorphs. In: Proceedings 2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference, CLEO/Europe-EQEC 2015: . Paper presented at 2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference, CLEO/Europe-EQEC 2015; International Congress Centre (ICM)Munich; Germany; 21 June 2015 through 25 June 2015. Optical Society of America
Open this publication in new window or tab >>Blue light induced infrared absorption and color-center fluorescence in KTP isomorphs
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2019 (English)In: Proceedings 2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference, CLEO/Europe-EQEC 2015, Optical Society of America, 2019Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Optical Society of America, 2019
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-251855 (URN)2-s2.0-85063818612 (Scopus ID)9781467374750 (ISBN)
Conference
2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference, CLEO/Europe-EQEC 2015; International Congress Centre (ICM)Munich; Germany; 21 June 2015 through 25 June 2015
Note

QC 20190528

Available from: 2019-05-28 Created: 2019-05-28 Last updated: 2019-05-28Bibliographically approved
Viotti, A.-L., Laurell, F., Zukauskas, A., Canalias, C. & Pasiskevicius, V. (2019). Coherent phase transfer and pulse compressionat 1.4μm in a backward-wave OPO [Letter to the editor]. Optics Letters, 44(12), 3066-3069
Open this publication in new window or tab >>Coherent phase transfer and pulse compressionat 1.4μm in a backward-wave OPO
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2019 (English)In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 44, no 12, p. 3066-3069Article in journal, Letter (Refereed) Published
Abstract [en]

The frequency modulation transfer property of a backward-wave optical parametric oscillator (BWOPO) is investigated in the context of near-IR pulse compression. The maximum transferrable bandwidth from the pump to the forward wave in a BWOPO is determined by the group dispersion mismatch. In comparison, the third-order phase introduced in a single-grating compressor setup is more detrimental to achieve optimum compression of the BWOPO forward wave. Nevertheless, we demonstrate a 220 GHz bandwidth transfer from 800 nm to 1.4 μm, with a compression factor of 115, leading to near-IR pulses as short as 1.3 ps with μJ energy.

National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-252767 (URN)10.1364/OL.44.003066 (DOI)000471636700031 ()2-s2.0-85067983411 (Scopus ID)
Note

QC 20190610

Available from: 2019-06-07 Created: 2019-06-07 Last updated: 2019-07-29Bibliographically approved
Viotti, A.-L., Laurell, F., Zukauskas, A., Canalias, C. & Pasiskevicius, V. (2019). Coherent Temporal Phase Transfer in Backward Wave Parametric Oscillator at 1.4 mu m. In: 2019 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO): . Paper presented at Conference on Lasers and Electro-Optics (CLEO), MAY 05-10, 2019, San Jose, CA. IEEE
Open this publication in new window or tab >>Coherent Temporal Phase Transfer in Backward Wave Parametric Oscillator at 1.4 mu m
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2019 (English)In: 2019 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), IEEE , 2019Conference paper, Published paper (Refereed)
Abstract [en]

The frequency modulation transfer property of a backward wave optical parametric oscillator is employed to generate compressed near-IR pulses at 1.4 mu m with 1.3ps duration. Limitations to the linear frequency modulation transfer in BWOPO are investigated.

Place, publisher, year, edition, pages
IEEE, 2019
Series
Conference on Lasers and Electro-Optics, ISSN 2160-9020
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-259468 (URN)10.1364/CLEO_SI.2019.SF1H.4 (DOI)000482226303038 ()2-s2.0-85069227937 (Scopus ID)978-1-943580-57-6 (ISBN)
Conference
Conference on Lasers and Electro-Optics (CLEO), MAY 05-10, 2019, San Jose, CA
Note

QC 20190920

Available from: 2019-09-20 Created: 2019-09-20 Last updated: 2020-01-13Bibliographically approved
Viotti, A.-L., Laurell, F., Zukauskas, A., Canalias, C. & Pasiskevicius, V. (2019). Coherent temporal phase transfer in backward wave parametric oscillator at 1.4 µm. In: Optics InfoBase Conference Papers: . Paper presented at CLEO: Science and Innovations, CLEO_SI 2019, 5 May 2019 through 10 May 2019. OSA - The Optical Society
Open this publication in new window or tab >>Coherent temporal phase transfer in backward wave parametric oscillator at 1.4 µm
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2019 (English)In: Optics InfoBase Conference Papers, OSA - The Optical Society , 2019Conference paper, Published paper (Refereed)
Abstract [en]

The frequency modulation transfer property of a backward wave optical parametric oscillator is employed to generate compressed near-IR pulses at 1.4µm with 1.3ps duration. Limitations to the linear frequency modulation transfer in BWOPO are investigated.

Place, publisher, year, edition, pages
OSA - The Optical Society, 2019
Keywords
Chirp modulation, Optical parametric oscillators, Backward waves, Linear frequency modulation, Modulation transfer, Near-IR, Temporal phase, Frequency modulation
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-262475 (URN)10.1364/CLEO_SI.2019.SF1H.4 (DOI)2-s2.0-85068126852 (Scopus ID)9781557528209 (ISBN)
Conference
CLEO: Science and Innovations, CLEO_SI 2019, 5 May 2019 through 10 May 2019
Note

QC 20191016

Available from: 2019-10-16 Created: 2019-10-16 Last updated: 2019-10-16Bibliographically approved
Yang, X., Lindberg, R., Magrulis, W., Fröjdh, K. & Laurell, F. (2019). Continuously tunable, narrow-linewidth laser based on a semiconductor optical amplifier and a linearly chirped fiber Bragg grating. Optics Express, 27(10), 14213-14220
Open this publication in new window or tab >>Continuously tunable, narrow-linewidth laser based on a semiconductor optical amplifier and a linearly chirped fiber Bragg grating
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2019 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 27, no 10, p. 14213-14220Article in journal (Refereed) Published
Abstract [en]

We describe a simple, narrow-linewidth, tunable fiber-based laser with a high degree of tuning accuracy. A polarization independent semiconductor optical amplifier (SOA) is used as the gain medium in a unidirectional fiber ring cavity with a circulator connected to a 6-meter long chirped fiber Bragg grating (CFBG). The laser wavelength is chosen by setting the modulation frequency of the SOA the same as the harmonics of the fundamental repetition rate of the light reflected at a specific point on the CFBG. Careful management of the drive current and pulse width helps to generate laser light of narrow linewidth (less than 0.03 nm) with low power variation (1.46 dB) over a tuning range of 40 nm.

Place, publisher, year, edition, pages
Optical Society of America, 2019
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-252757 (URN)10.1364/OE.27.014213 (DOI)000469220500055 ()31163873 (PubMedID)2-s2.0-85065826170 (Scopus ID)
Note

QC 20190610

Available from: 2019-06-06 Created: 2019-06-06 Last updated: 2019-10-09Bibliographically approved
Strömberg, A., Omanakuttan, G., Mu, T., Natesan, P. V., Tofa, T. S., Bailly, M., . . . Sun, Y.-T. (2019). Direct Heteroepitaxy of Orientation-Patterned GaP on GaAs by Hydride Vapor Phase Epitaxy for Quasi-Phase-Matching Applications. Physica status solidi. A, Applied research
Open this publication in new window or tab >>Direct Heteroepitaxy of Orientation-Patterned GaP on GaAs by Hydride Vapor Phase Epitaxy for Quasi-Phase-Matching Applications
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2019 (English)In: Physica status solidi. A, Applied research, ISSN 0031-8965, E-ISSN 1521-396XArticle in journal (Refereed) Epub ahead of print
Abstract [en]

Heteroepitaxial growth of orientation‐patterned (OP) GaP (OP‐GaP) on wafer‐bonded OP‐GaAs templates is investigated by low‐pressure hydride vapor phase epitaxy for exploiting the beneficial low two‐photon absorption properties of GaP with the matured processing technologies and higher‐quality substrates afforded by GaAs. First, GaP homoepitaxial selective area growth (SAG) is conducted to investigate the dependence of GaP SAG on precursor flows and temperatures toward achieving a high vertical growth rate and equal lateral growth rate in the [110] and [-110]‐oriented openings. Deteriorated domain fidelity is observed in the heteroepitaxial growth of OP‐GaP on OP‐GaAs due to the enhanced growth rate on domain boundaries by threading dislocations generated by 3.6% lattice matching in GaP/GaAs. The dependence of dislocation dynamics on heteroepitaxial growth conditions of OP‐GaP on OP‐GaAs is studied. High OP‐GaP domain fidelity associated with low threading dislocation density and a growth rate of 57 μm h−1 are obtained by increasing GaCl flow. The properties of heteroepitaxial GaP on semi‐insulating GaAs is studied by terahertz time‐domain spectroscopy in the terahertz range. The outcomes of this work will pave the way to exploit heteroepitaxial OP‐GaP growth on OP‐GaAs for frequency conversion by quasi‐phase‐matching in the mid‐infrared and terahertz regions.

Keywords
heteroepitaxy, hydride vapor phase epitaxy, orientation-patterned GaP, quasi-phase-matching, wafer-bonded orientation-patterned GaAs
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-263074 (URN)10.1002/pssa.201900627 (DOI)000491109100001 ()2-s2.0-85074368712 (Scopus ID)
Funder
Knut and Alice Wallenberg Foundation
Note

QC 20191111

Available from: 2019-10-29 Created: 2019-10-29 Last updated: 2019-11-11Bibliographically approved
Kores, C. C., Ismail, N., Bernhardi, E. H., Laurell, F. & Pollnau, M. (2019). Distributed phase shift and lasing wavelength in distributed-feedback resonators. In: : . Paper presented at European Conference on Integrated Optics (ECIO), 23 - 26 April 2019, Ghent - Belgium. , Article ID W.Po1.6.
Open this publication in new window or tab >>Distributed phase shift and lasing wavelength in distributed-feedback resonators
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2019 (English)Conference paper, Poster (with or without abstract) (Refereed)
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-251673 (URN)
Conference
European Conference on Integrated Optics (ECIO), 23 - 26 April 2019, Ghent - Belgium
Note

QC 20190626

Available from: 2019-05-17 Created: 2019-05-17 Last updated: 2019-12-20Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-7688-1367

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