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Publications (10 of 636) 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: 2019-06-11Bibliographically 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)10.23919/CLEO.2019.8750599 (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: 2019-09-20Bibliographically 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
Malmström, M., Forsberg, P., Cai, Y., Karlsson, M., Nikolajeff, F. & Laurell, F. (2019). Diamond waveguides for mid-IR chemical sensing. 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 >>Diamond waveguides for mid-IR chemical sensing
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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-251850 (URN)2-s2.0-85063843713 (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 20190523

Available from: 2019-05-23 Created: 2019-05-23 Last updated: 2019-05-23Bibliographically 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: 2019-06-26Bibliographically approved
Kianirad, H., Canalias, C. & Laurell, F. (2019). Domain wall motion in stoichiometric LiTaO3 induced by low-energy electron beam [Letter to the editor]. Applied Physics Letters
Open this publication in new window or tab >>Domain wall motion in stoichiometric LiTaO3 induced by low-energy electron beam
2019 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118Article in journal, Letter (Refereed) Submitted
Abstract [en]

Scanning electron microscopy was used to study the mobility of domain walls in vapor-transport equilibrated stoichiometric LiTaO3. By using low-acceleration voltage, switching occurs solely for polarization pointing-up domains, resulting in fast domain-wall motion. When the incoming electron beam was more energetic with larger penetration depth, the switching instead occurred for polarization pointing down domains. Our results are discussed in terms of the interaction of the scanning electron beam with the polarization-screening charges at the crystal surface.

Keywords
ferroelectrics, domain wall
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-249385 (URN)
Note

QC 20190412

Available from: 2019-04-11 Created: 2019-04-11 Last updated: 2019-04-12Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-7688-1367

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