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Publications (10 of 595) Show all publications
Canalias, C. C., Zukauskas, A., Tjörnhamman, S., Viotti, A.-L., Pasiskevicius, V. & Laurell, F. (2018). Highly efficient periodically poled KTP-isomorphs with large apertures and extreme domain aspect-ratios. In: Nonlinear Frequency Generation and Conversion: Materials and Devices XVII: . Paper presented at Nonlinear Frequency Generation and Conversion: Materials and Devices XVII 2018; San Francisco; United States; 29 January 2018 through 31 January 2018. SPIE - International Society for Optical Engineering, 10516, Article ID 105160W.
Open this publication in new window or tab >>Highly efficient periodically poled KTP-isomorphs with large apertures and extreme domain aspect-ratios
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2018 (English)In: Nonlinear Frequency Generation and Conversion: Materials and Devices XVII, SPIE - International Society for Optical Engineering, 2018, Vol. 10516, article id 105160WConference paper, Published paper (Refereed)
Abstract [en]

Since the early 1990's, a substantial effort has been devoted to the development of quasi-phased-matched (QPM) nonlinear devices, not only in ferroelectric oxides like LiNbO3, LiTaO3 and KTiOPO4 (KTP), but also in semiconductors as GaAs, and GaP. The technology to implement QPM structures in ferroelectric oxides has by now matured enough to satisfy the most basic frequency-conversion schemes without substantial modification of the poling procedures. Here, we present a qualitative leap in periodic poling techniques that allows us to demonstrate devices and frequency conversion schemes that were deemed unfeasible just a few years ago. Thanks to our short-pulse poling and coercive-field engineering techniques, we are able to demonstrate large aperture (5 mm) periodically poled Rb-doped KTP devices with a highly-uniform conversion efficiency over the whole aperture. These devices allow parametric conversion with energies larger than 60 mJ. Moreover, by employing our coercive-field engineering technique we fabricate highlyefficient sub-μm periodically poled devices, with periodicities as short as 500 nm, uniform over 1 mm-Thick crystals, which allow us to realize mirrorless optical parametric oscillators with counter-propagating signal and idler waves. These novel devices present unique spectral and tuning properties, superior to those of conventional OPOs. Furthermore, our techniques are compatible with KTA, a KTP isomorph with extended transparency in the mid-IR range. We demonstrate that our highly-efficient PPKTA is superior both for mid-IR and for green light generation-as a result of improved transmission properties in the visible range. Our KTP-isomorph poling techniques leading to highly-efficient QPM devices will be presented. Their optical performance and attractive damage thresholds will be discussed.

Place, publisher, year, edition, pages
SPIE - International Society for Optical Engineering, 2018
Series
Proceedings of SPIE - The International Society for Optical Engineering, ISSN 0277-786X ; 10516
Keywords
Counter-propagating interactions, KTP isomorphs, Large-Aperture, MOPO, Periodic poling, QPM devices
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-229334 (URN)10.1117/12.2288174 (DOI)2-s2.0-85047338956 (Scopus ID)9781510615175 (ISBN)
Conference
Nonlinear Frequency Generation and Conversion: Materials and Devices XVII 2018; San Francisco; United States; 29 January 2018 through 31 January 2018
Note

QC 20180604

Available from: 2018-06-04 Created: 2018-06-04 Last updated: 2018-06-04Bibliographically approved
Lindberg, R., Bogusławski, J., Pasternak, I., Przewłoka, A., Laurell, F., Pasiskevicius, V. & Sotor, J. (2018). Mapping Mode-Locking Regimes in a Polarization-Maintaining Er-Doped Fiber Laser. IEEE Journal of Selected Topics in Quantum Electronics, 24(3), 1-9
Open this publication in new window or tab >>Mapping Mode-Locking Regimes in a Polarization-Maintaining Er-Doped Fiber Laser
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2018 (English)In: IEEE Journal of Selected Topics in Quantum Electronics, ISSN 1077-260X, E-ISSN 1558-4542, Vol. 24, no 3, p. 1-9Article in journal (Refereed) Published
Abstract [en]

We present the performance of an all polarization-maintaining Erbium-doped fiber laser mode-locked by a multilayer graphene based saturable absorber. The cavity incorporates a Martinez-type compressor, based on a transmission grating, which allows for continuous tuning of the net cavity dispersion as well as spectral filtering. By adjusting the dispersion and the spectral bandwidth, we could operate the laser in the soliton, the dispersion managed soliton and the absorber-limited pulse regimes. The pulse durations from the laser ranged between 338 fs to 2.1 ps and the laser could be operated at nearly constant output powers in the anomalous and the normal dispersion regimes. We also conducted stability analyses based on dispersive Fourier transform measurements in the different operating regimes. Comparison of the collected spectra reveals that the soliton regime had the best overall stability.

Place, publisher, year, edition, pages
IEEE Press, 2018
National Category
Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
urn:nbn:se:kth:diva-221176 (URN)10.1109/JSTQE.2017.2769057 (DOI)000422766800001 ()2-s2.0-85033727301 (Scopus ID)
Note

QC 20180116

Available from: 2018-01-15 Created: 2018-01-15 Last updated: 2018-03-13Bibliographically approved
Coetzee, R. S., Zheng, X., Fregnani, L., Laurell, F. & Pasiskevicius, V. (2018). Narrowband, tunable, 2 A mu m optical parametric master-oscillator power amplifier with large-aperture periodically poled Rb:KTP. Applied physics. B, Lasers and optics (Print), 124(6), Article ID 124.
Open this publication in new window or tab >>Narrowband, tunable, 2 A mu m optical parametric master-oscillator power amplifier with large-aperture periodically poled Rb:KTP
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2018 (English)In: Applied physics. B, Lasers and optics (Print), ISSN 0946-2171, E-ISSN 1432-0649, Vol. 124, no 6, article id 124Article in journal (Refereed) Published
Abstract [en]

A high-energy, ns, narrow-linewidth optical parametric oscillator and amplifier system based on large-aperture periodically poled Rb:KTP is presented. The 2 A mu m seed source is a singly resonant OPO locked with a transversely chirped volume Bragg grating, allowing a wavelength tuning of 21 nm and output linewidth of 0.56 nm. A maximum output energy of 52 mJ and conversion efficiency of 36% was obtained from the amplifier for a pump energy of 140 mJ. The high-energy and the robust and narrow dual-wavelength spectra obtained make this system an ideal pump source for difference frequency generation-based THz generation schemes.

Place, publisher, year, edition, pages
SPRINGER, 2018
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-230830 (URN)10.1007/s00340-018-6992-z (DOI)000433995500001 ()2-s2.0-85048039639 (Scopus ID)
Note

QC 20180619

Available from: 2018-06-19 Created: 2018-06-19 Last updated: 2018-06-19Bibliographically approved
Coetzee, R. S., Zheng, X., Fregnani, L., Laurell, F. & Pasiskevicius, V. (2018). Narrowband, tunable, 2 μm optical parametric master-oscillator power amplifier with large-aperture periodically poled Rb:KTP. Applied physics. B, Lasers and optics (Print)
Open this publication in new window or tab >>Narrowband, tunable, 2 μm optical parametric master-oscillator power amplifier with large-aperture periodically poled Rb:KTP
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2018 (English)In: Applied physics. B, Lasers and optics (Print), ISSN 0946-2171, E-ISSN 1432-0649Article in journal (Refereed) Accepted
Place, publisher, year, edition, pages
Springer, 2018
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-228409 (URN)
Note

QC 20180528

Available from: 2018-05-24 Created: 2018-05-24 Last updated: 2018-05-28Bibliographically approved
Viotti, A.-L., Lindberg, R., Zukauskas, A., Budriunas, R., Kucinskas, D., Stanislauskas, T., . . . Pasiskevicius, V. (2018). Supercontinuum generation and soliton self-compression in chi((2))-structured KTiOPO4. Operator Theory: Advances and Applications, 5(6), 711-717
Open this publication in new window or tab >>Supercontinuum generation and soliton self-compression in chi((2))-structured KTiOPO4
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2018 (English)In: Operator Theory: Advances and Applications, ISSN 1004-4469, E-ISSN 2334-2536, Vol. 5, no 6, p. 711-717Article in journal (Refereed) Published
Abstract [en]

Ultrafast sources in the mid-IR are indispensable research tools for spectroscopic and medical applications and can also potentially be used to generate attosecond pulses. We investigated a route to directly achieve self-compressed supercontinuum pulses with an octave-exceeding spectrum extending into the mid-IR by employing self-defocusing nonlinearities obtained through cascaded chi((2)) interactions in domain-structured ferroelectrics. A model was developed based on a single-wave nonlinear envelope equation that accounts for cascaded chi((2)) nonlinearities, the native Kerr response from the third-order nonlinear polarization, and the delayed Raman response. Experimental validation of the model was carried out by using an in-house fabricated, periodically poled, Rb-doped KTiOPO4 crystal with a period of 36 mu m. A supercontinuum spectrum spanning from 1.1 to 2.7 mu m was achieved, as well as self-compression down to 18.6 fs, from a 128 fs pump pulse at 1.52 mu m. Using the actual pump pulse and sample parameters, excellent agreement was reached between the model and the experimental results, thus proving the validity of the model. As periodically poled KTiOPO4 can be obtained with large apertures, this approach is energy scalable and hence promising for future development in the field.

Place, publisher, year, edition, pages
OPTICAL SOC AMER, 2018
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-232257 (URN)10.1364/OPTICA.5.000711 (DOI)000435967000008 ()2-s2.0-85048790962 (Scopus ID)
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation, 2016.0104European Regional Development Fund (ERDF), 01.2.2-LMT-K-718
Note

QC 20180720

Available from: 2018-07-20 Created: 2018-07-20 Last updated: 2018-07-20Bibliographically approved
Lindberg, R., Jakub, B., Abramski, K., Laurell, F., Pasiskevicius, V. & Jaroslaw, S. (2017). All Polarization-maintaining Er-doped Fiber Laser Modelocked by a Graphene Saturable Absorber Employing an Intra-cavity Compressor for Dispersion Management. In: : . Paper presented at Workshop on Specialty Optical Fiber and Their Applications.
Open this publication in new window or tab >>All Polarization-maintaining Er-doped Fiber Laser Modelocked by a Graphene Saturable Absorber Employing an Intra-cavity Compressor for Dispersion Management
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2017 (English)Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

The performance of a stable dispersion tunable Erbium doped fiber laser modelocked by multi-layer graphene is presented and discussed. The cavity is based on all PM fibers and a free-space Martinez compressor.

Keywords
Ultrafast lasers, Fiber lasers, Pulse shaping
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-217100 (URN)
Conference
Workshop on Specialty Optical Fiber and Their Applications
Note

QC 20180110

Available from: 2017-10-31 Created: 2017-10-31 Last updated: 2018-01-10Bibliographically approved
Tian, J., Yang, Y., Qiu, M., Laurell, F., Pasiskevicius, V. & Jang, H. (2017). All-dielectric KTiOPO4 metasurfaces based on multipolar resonances in the terahertz region. Optics Express, 25(20), 24068-24080
Open this publication in new window or tab >>All-dielectric KTiOPO4 metasurfaces based on multipolar resonances in the terahertz region
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2017 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 25, no 20, p. 24068-24080Article in journal (Refereed) Published
Place, publisher, year, edition, pages
Optical Society of America, 2017
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-216615 (URN)10.1364/OE.25.024068 (DOI)000412048500059 ()2-s2.0-85030469912 (Scopus ID)
Note

QC 20171110

Available from: 2017-11-10 Created: 2017-11-10 Last updated: 2018-03-12Bibliographically approved
Viotti, A.-L., Lindberg, R., Laurell, F. & Pasiskevicius, V. (2017). Cascaded Soliton Self-Compression and Mid-Infrared Supercontinuum Generation in chi((2))-Structured KTP and KTA. In: 2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO): . Paper presented at Conference on Lasers and Electro-Optics (CLEO), MAY 14-19, 2017, San Jose, CA. IEEE
Open this publication in new window or tab >>Cascaded Soliton Self-Compression and Mid-Infrared Supercontinuum Generation in chi((2))-Structured KTP and KTA
2017 (English)In: 2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO), IEEE , 2017Conference paper, Published paper (Refereed)
Abstract [en]

Periodically poled KTP and KTA were numerically investigated for nonlinear pulse compression in the normal and anomalous dispersion regimes using cascaded chi((2)) interactions. The generation of sub-10 fs octave-spanning supercontinuum pulses is shown.

Place, publisher, year, edition, pages
IEEE, 2017
Series
Conference on Lasers and Electro-Optics, ISSN 2160-9020
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-226253 (URN)10.1364/CLEO_QELS.2017.JTh2A.79 (DOI)000427296201143 ()2-s2.0-85044204978 (Scopus ID)978-1-9435-8027-9 (ISBN)
Conference
Conference on Lasers and Electro-Optics (CLEO), MAY 14-19, 2017, San Jose, CA
Note

QC 20180528

Available from: 2018-05-28 Created: 2018-05-28 Last updated: 2018-05-28Bibliographically approved
Lobov, G. S., Marinins, A., Etcheverry, S., Zhao, Y., Vasileva, E., Sugunan, A., . . . Popov, S. (2017). Direct birefringence and transmission modulation via dynamic alignment of P3HT nanofibers in an advanced opto-fluidic component. Optical Materials Express, 7(1), 52-61
Open this publication in new window or tab >>Direct birefringence and transmission modulation via dynamic alignment of P3HT nanofibers in an advanced opto-fluidic component
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2017 (English)In: Optical Materials Express, ISSN 2159-3930, E-ISSN 2159-3930, Vol. 7, no 1, p. 52-61Article in journal (Refereed) Published
Abstract [en]

Poly-3-hexylthiophene (P3HT) nanofibers are semiconducting high-aspect ratio nanostructures with anisotropic absorption and birefringence properties found at different regions of the optical spectrum. In addition, P3HT nanofibers possess an ability to be aligned by an external electric field, while being dispersed in a liquid. In this manuscript we show that such collective ordering of nanofibers, similar to liquid crystal material, significantly changes the properties of transmitted light. With a specially fabricated opto-fluidic component, we monitored the phase and transmission modulation of light propagating through the solution of P3HT nanofibers, being placed in the electric field with strength up to 0.1 V/mu m. This report describes a technique for light modulation, which can be implemented in optical fiber-based devices or on-chip integrated components.

Place, publisher, year, edition, pages
Optical Society of America, 2017
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-202445 (URN)10.1364/OME.7.000052 (DOI)000392205600007 ()2-s2.0-85008157720 (Scopus ID)
Funder
Swedish Research Council, VR-SRL 2012-4421Swedish Research Council, VR-SRL 2013-6780Swedish Foundation for Strategic Research , EM11-0002
Note

QC 20170306

Available from: 2017-03-06 Created: 2017-03-06 Last updated: 2017-11-29Bibliographically approved
Etcheverry, S., Faridi, M. A., Ramachandraiah, H., Kumar, T., Margulis, W., Laurell, F. & Russom, A. (2017). High performance micro-flow cytometer based on optical fibres. Scientific Reports, 7, Article ID 5628.
Open this publication in new window or tab >>High performance micro-flow cytometer based on optical fibres
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2017 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 7, article id 5628Article in journal (Refereed) Published
Abstract [en]

Flow cytometry is currently the gold standard for analysis of cells in the medical laboratory and biomedical research. Fuelled by the need of point-of-care diagnosis, a significant effort has been made to miniaturize and reduce cost of flow cytometers. However, despite recent advances, current microsystems remain less versatile and much slower than their large-scale counterparts. In this work, an all-silica fibre microflow cytometer is presented that measures fluorescence and scattering from particles and cells. It integrates cell transport in circular capillaries and light delivery by optical fibres. Single-stream cell focusing is performed by Elasto-inertial microfluidics to guarantee accurate and sensitive detection. The capability of this technique is extended to high flow rates (up to 800 mu l/min), enabling a throughput of 2500 particles/s. The robust, portable and low-cost system described here could be the basis for a point-of-care flow cytometer with a performance comparable to commercial systems.

Place, publisher, year, edition, pages
Nature Publishing Group, 2017
National Category
Biological Sciences
Identifiers
urn:nbn:se:kth:diva-211606 (URN)10.1038/s41598-017-05843-7 (DOI)000405677200013 ()2-s2.0-85025168074 (Scopus ID)
Funder
Science for Life Laboratory - a national resource center for high-throughput molecular bioscienceSwedish Research CouncilKnut and Alice Wallenberg FoundationSwedish Childhood Cancer Foundation
Note

QC 20170814

Available from: 2017-08-14 Created: 2017-08-14 Last updated: 2017-10-17Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-7688-1367

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