Change search
Link to record
Permanent link

Direct link
BETA
Alternative names
Publications (10 of 628) 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
Show others...
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
Show others...
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
Show others...
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
Show others...
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
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
Show others...
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)2-s2.0-85065826170 (Scopus ID)
Note

QC 20190610

Available from: 2019-06-06 Created: 2019-06-06 Last updated: 2019-06-10Bibliographically 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
Show others...
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
Show others...
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
Zukauskas, A., Pasiskevicius, V., Laurell, F. & Canalias, C. (2019). Fan-out periodically poled structures in Rb-doped KTiOPO4 for continuously tunable QPM devices. In: Schunemann, PG Schepler, KL (Ed.), NONLINEAR FREQUENCY GENERATION AND CONVERSION: MATERIALS AND DEVICES XVIII. Paper presented at Conference on Nonlinear Frequency Generation and Conversion - Materials and Devices XVIII, FEB 05-07, 2019, San Francisco, CA. SPIE-INT SOC OPTICAL ENGINEERING, Article ID UNSP 109020N.
Open this publication in new window or tab >>Fan-out periodically poled structures in Rb-doped KTiOPO4 for continuously tunable QPM devices
2019 (English)In: NONLINEAR FREQUENCY GENERATION AND CONVERSION: MATERIALS AND DEVICES XVIII / [ed] Schunemann, PG Schepler, KL, SPIE-INT SOC OPTICAL ENGINEERING , 2019, article id UNSP 109020NConference paper, Published paper (Refereed)
Abstract [en]

Since the first demonstration of electric field poling in 1993, the use of quasi-phase matching (QPM) technique has gained wide adoption in a multitude of applications. The QPM field today is dominated mainly by the ferroelectric oxide materials from LiNbO3 (LN) and KTiOPO4 (KTP) families, where QPM structures are implemented by the electric field poling technique. While typical QPM devices have a fixed-period, one-dimensional domain grating design, which is the most straightforward to implement, numerous applications require the ability to continuously tune the wavelength over a wider spectral range. For applications where temperature tuning is not desired, a fan-out QPM grating design may be advantageous. The tuning here is performed by transverse translation of the structure in respect to the pump beam, while keeping the crystal temperature constant. While the implementation of fan-out gratings is reasonably well researched in LN, there is a lack of reliable data for KTP isomorphs. Taking into account the high domain growth anisotropy in KTP, an important factor becomes the angle between the domain walls and the b-axis of the crystal. This angle directly affects the quality and dimensions of the QPM device. However, its upper boundary has not been determined to date. In this work we discuss the prospects and limitations of PPKTP devices with fan-out grating designs. We present a fan-out PPRKTP device, where the transverse fan-out rate is 0.5 mu m/mm. In an OPO configuration pumped by 532 nm such PPRKTP crystal is able to provide continuously tunable radiation between 0.7 -2.2 mu m.

Place, publisher, year, edition, pages
SPIE-INT SOC OPTICAL ENGINEERING, 2019
Series
Proceedings of SPIE, ISSN 0277-786X ; 10902
Keywords
periodic poling, KTP, frequency conversion, fan-out, OPO, parametric devices
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-255236 (URN)10.1117/12.2505623 (DOI)000471820400013 ()2-s2.0-85066756130 (Scopus ID)978-1-5106-2447-4 (ISBN)
Conference
Conference on Nonlinear Frequency Generation and Conversion - Materials and Devices XVIII, FEB 05-07, 2019, San Francisco, CA
Note

QC 20190730

Available from: 2019-07-30 Created: 2019-07-30 Last updated: 2019-07-30
Song, S., Lonsethagen, K., Laurell, F., Hawkins, T. W., Ballato, J., Fokine, M. & Gibson, U. J. (2019). Laser restructuring and photoluminescence of glass-clad GaSb/Si-core optical fibres. Nature Communications, 10, Article ID 1790.
Open this publication in new window or tab >>Laser restructuring and photoluminescence of glass-clad GaSb/Si-core optical fibres
Show others...
2019 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 10, article id 1790Article in journal (Refereed) Published
Abstract [en]

Semiconductor-core optical fibres have potential applications in photonics and optoelectronics due to large nonlinear optical coefficients and an extended transparency window. Laser processing can impose large temperature gradients, an ability that has been used to improve the uniformity of unary fibre cores, and to inscribe compositional variations in alloy systems. Interest in an integrated light-emitting element suggests a move from Group IV to III-V materials, or a core that contains both. This paper describes the fabrication of GaSb/Si core fibres, and a subsequent CO2 laser treatment that aggregates large regions of GaSb without suppressing room temperature photoluminescence. The ability to isolate a large III-V crystalline region within the Si core is an important step towards embedding semiconductor light sources within infrared light-transmitting silicon optical fibre.

Place, publisher, year, edition, pages
NATURE PUBLISHING GROUP, 2019
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-251483 (URN)10.1038/s41467-019-09835-1 (DOI)000464976200003 ()30996257 (PubMedID)2-s2.0-85064540314 (Scopus ID)
Note

QC 20190522

Available from: 2019-05-22 Created: 2019-05-22 Last updated: 2019-05-29Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-7688-1367

Search in DiVA

Show all publications