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Publications (10 of 652) Show all publications
Lindberg, R., Laurell, F., Fröjdh, K. & Margulis, W. (2020). C-cavity fiber laser employing a chirped fiber Bragg grating for electrically gated wavelength tuning. Optics Express
Open this publication in new window or tab >>C-cavity fiber laser employing a chirped fiber Bragg grating for electrically gated wavelength tuning
2020 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087Article in journal (Refereed) Published
Abstract [en]

We present a novel C-cavity concept for tunable lasers. The laser is based on a semiconductor optical amplifier (SOA), serving both as a gain medium as well as a modulator, and a chirped fiber Bragg grating (C-FBG) which acts as the end mirrors on both cavity ends. Driving the SOA with a pulse pair with variable delay enables wavelength tuning by targeting different regions in the C-FBG with the circulating pulse. The cavity design allows for wide tuning while maintaining a constant repetition rate, we show a tuning range of 35 nm -limited by the C-FBG’s reflection bandwidth. Time-multiplexed operation with four different wavelengths is also demonstrated. Furthermore, the laser performance and dynamics under different operating conditions are analyzed and discussed.

National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-271114 (URN)10.1364/OE.383398 (DOI)
Note

QC 20200318

Available from: 2020-03-18 Created: 2020-03-18 Last updated: 2020-03-18Bibliographically approved
Widarsson, M., Henriksson, M., Mutter, P., Canalias, C., Pasiskevicius, V. & Laurell, F. (2020). High resolution and sensitivity up-conversion mid-infrared photon-counting LIDAR. Applied Optics
Open this publication in new window or tab >>High resolution and sensitivity up-conversion mid-infrared photon-counting LIDAR
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2020 (English)In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165Article in journal (Refereed) Published
Abstract [en]

A single-photon-counting mid-infrared LIDAR is presented. 2.4 µm mid-infrared photons were up-converted to 737 nm by intra-cavity mixing in a periodically poled rubidium-doped KTiOPO4 crystal inside a Nd:YVO4 laser. The up-converted photons were detected by a Si single-photon avalanche photodiode (SPAD). A temporal resolution of 42 ps and a dark count rate of 500 Hz were achieved, limited by the SPAD and ambient light leakage. It allowed for detection of two targets separated by only a few millimeters. This technique is easily extendable to longer wavelengths, limited primarily by the nonlinear crystal transparency.

National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-271863 (URN)
Available from: 2020-04-08 Created: 2020-04-08 Last updated: 2020-04-08
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: 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC): . Paper presented at 2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference. IEEE conference proceedings
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)In: 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), IEEE conference proceedings, 2019Conference paper, Published paper (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.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2019
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-265647 (URN)10.1109/CLEOE-EQEC.2019.8872861 (DOI)2-s2.0-85074635962 (Scopus ID)
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: 2020-03-31Bibliographically 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 ()31199382 (PubMedID)2-s2.0-85067983411 (Scopus ID)
Note

QC 20190610

Available from: 2019-06-07 Created: 2019-06-07 Last updated: 2020-03-09Bibliographically 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
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-7688-1367

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