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Publications (10 of 23) Show all publications
Lindberg, R., Zeil, P., Malmström, M., Pasiskevicius, V. & Laurell, F. (2016). Numerical Study and Validation of Ultra-short Pulse Amplification in Fiber Amplifiers at High Repetition Rates. In: : . Paper presented at Conference on Lasers and Electro-Optics. Optical Society of America
Open this publication in new window or tab >>Numerical Study and Validation of Ultra-short Pulse Amplification in Fiber Amplifiers at High Repetition Rates
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2016 (English)Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

We present a numerical method for studying fiber-based ultra-short pulse amplification at high repetition rates. Validation of the simulations, by comparison with experimental results, are also presented.

Place, publisher, year, edition, pages
Optical Society of America, 2016
National Category
Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
urn:nbn:se:kth:diva-188881 (URN)10.1364/CLEO_SI.2016.SM1Q.6 (DOI)000391286402312 ()2-s2.0-85010669833 (Scopus ID)
Conference
Conference on Lasers and Electro-Optics
Funder
Swedish Research Council
Note

QC 20160712

Available from: 2016-06-20 Created: 2016-06-20 Last updated: 2017-06-15Bibliographically approved
Zeil, P., Thilmann, N., Pasiskevicius, V. & Laurell, F. (2015). Eciency-optimized, 30W continuous-waveOPO employing a variable re ectivity volume Bragg grating. In: : . Paper presented at CLEO Europe - Conference on Lasers and Electro-Optics,June 21st - June 25th, 2015, Munich (ICM), Germany.
Open this publication in new window or tab >>Eciency-optimized, 30W continuous-waveOPO employing a variable re ectivity volume Bragg grating
2015 (English)Conference paper, Poster (with or without abstract) (Refereed)
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-179648 (URN)
Conference
CLEO Europe - Conference on Lasers and Electro-Optics,June 21st - June 25th, 2015, Munich (ICM), Germany
Note

QC 20160107

Available from: 2015-12-18 Created: 2015-12-18 Last updated: 2016-01-07Bibliographically approved
Lindberg, R., Zeil, P., Malmström, M., Pasiskevicius, V. & Laurell, F. (2015). Modelling and optimization of high repetition rate fiber amplifiers. 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 >>Modelling and optimization of high repetition rate fiber amplifiers
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2015 (English)In: Proceedings 2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference, CLEO/Europe-EQEC 2015, Optical Society of America, 2015Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Optical Society of America, 2015
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-251853 (URN)2-s2.0-85063823247 (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 20190524

Available from: 2019-05-24 Created: 2019-05-24 Last updated: 2019-06-12Bibliographically approved
Zeil, P. (2015). Tailored fiber lasers and their use in nonlinear optics. (Doctoral dissertation). Stockholm: KTH Royal Institute of Technology
Open this publication in new window or tab >>Tailored fiber lasers and their use in nonlinear optics
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The objective of this thesis work was to develop tailored fiber lasers, which meet the pump requirement for efficient continuous-wave (cw) frequency conversion to the visible and the mid-infrared wavelength regimes: a stable, high-power, wavelength-tunable, narrow-linewidth output in a single polarization. As a first step, the prospect of tuning ytterbium fiber lasers over an unprecedented wavelength range, from 980nm to 1100nm, was investigated. The results further substantiate the enormous potential of fiber lasers to act as widely tunable pump sources for nonlinear frequency conversion schemes, allowing the design of coherent light sources in large parts of the optical spectrum. Subsequently, a method of flexible wavelength-tuning and -locking for high-power fiber oscillators was demonstrated, incorporating the use of a highly reflective transversely-chirped volume Bragg grating as cavity mirror. Through a simple lateral translation of the grating, continuous wavelength-tuning over 2.5 THz was achieved without sacrificing efficiency, spectral or spatial beam quality. As the latter free-space laser architecture relied on an intra-cavity polarization filter to ensure a linearly polarized output state, the filtered orthogonal polarization state was available for a secondary laser oscillation. Following this basic design idea, a high-power dual-wavelength laser with a tunable wavelength separation of up to 2 THz was demonstrated. With both signals separated in wavelength and polarization, gain competition was effectively suppressed and the presented source possessed the necessary stability for potential use in power-demanding applications such as difference frequency generation of cw THz radiation. After establishing a flexible and reliable fiber pump source, continuous-wave, quasi-phase matched, second harmonic generation experiments were performed on several crystals from the KTiOPO4 family. The power scaling limitations of these materials, when generating high-power signals in the visible spectral range were studied. Although, a conclusive identication of the optimal KTiOPO4 isomorph for this process was hindered due to varying crystal quality from different vendors, comparative transmission studies suggest that the arsenate isomorph, KTiOAsO4, could be best suited by virtue of its low linear absorption in the visible region. Finally, a singly-resonant optical parametric oscillator, pumped by the above narrowband fiber laser source, efficiently generated 11W of mid-infrared radiation at 3.4 µm and 19W single-frequency radiation at 1.55 µm. Stable, high-power operation of this parametric source was facilitated by a novel method of controlling the intra-cavity signal power using a volume Bragg grating with variable reectivity.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. p. xiii, 87
Series
TRITA-FYS, ISSN 0280-316X ; 2015:61
National Category
Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
urn:nbn:se:kth:diva-172976 (URN)978-91-7595-668-8 (ISBN)
Public defence
2015-09-25, Sal FB52, AlbaNova Universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20150904

Available from: 2015-09-04 Created: 2015-09-04 Last updated: 2015-09-04Bibliographically approved
Zeil, P., Pasiskevicius, V. & Laurell, F. (2015). Tunable, high-power, continuous-wave dual-polarization Yb-fiber oscillator. Optics Express, 23(13), 17450-17455
Open this publication in new window or tab >>Tunable, high-power, continuous-wave dual-polarization Yb-fiber oscillator
2015 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 23, no 13, p. 17450-17455Article in journal (Refereed) Published
Abstract [en]

We demonstrate a high-power, dual-polarization Yb-fiber oscillator, by separately locking the two linear polarization states defined by slow and fast axis of a polarization-maintaining gain fiber with volume Bragg gratings. Dual-line lasing is achieved with a tunable wavelength separation from 0.03 to 2 THz, while exceeding output powers of 78 W over the entire tuning range, maintaining a high beam-quality with M-2<1.2. With this laser configuration we achieve a peak-to-peak power variation of <1% for the dual-line signal and <3% for the individual signals.

National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-172727 (URN)10.1364/OE.23.017450 (DOI)000358543300094 ()26191754 (PubMedID)
Funder
Swedish Research Council
Note

QC 20150828

Available from: 2015-08-28 Created: 2015-08-27 Last updated: 2017-12-04Bibliographically approved
Laurell, F., Zeil, P., Tjörnhammar, S. & Pasiskevicius, V. (2015). Volume Bragg grating controlled light sources. In: : . Paper presented at Northern Optics & Photonics 2015 (NOP 2015), June 2015, Lappeenranta, Finland..
Open this publication in new window or tab >>Volume Bragg grating controlled light sources
2015 (English)Conference paper, Published paper (Refereed)
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-162183 (URN)
Conference
Northern Optics & Photonics 2015 (NOP 2015), June 2015, Lappeenranta, Finland.
Note

(invited)

QS 201504

Available from: 2015-03-23 Created: 2015-03-23 Last updated: 2015-04-23Bibliographically approved
Zeil, P., Thilmann, N., Pasiskevicius, V. & Laurell, F. (2014). Efficiency-optimized, 30 W continuous-wave OPO employing a variable reflectivity volume Bragg grating. In: Optics InfoBase Conference Papers: . Paper presented at European Conference on Lasers and Electro-Optics, CLEO 2015, 21 June 2015 through 25 June 2015. OSA - The Optical Society
Open this publication in new window or tab >>Efficiency-optimized, 30 W continuous-wave OPO employing a variable reflectivity volume Bragg grating
2014 (English)In: Optics InfoBase Conference Papers, OSA - The Optical Society , 2014Conference paper (Refereed)
Place, publisher, year, edition, pages
OSA - The Optical Society, 2014
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-216910 (URN)2-s2.0-85019532749 (Scopus ID)9781467374750 (ISBN)
Conference
European Conference on Lasers and Electro-Optics, CLEO 2015, 21 June 2015 through 25 June 2015
Note

Conference code: 131528; Export Date: 24 October 2017; Conference Paper. QC 20171030

Available from: 2017-10-30 Created: 2017-10-30 Last updated: 2017-10-30Bibliographically approved
Zeil, P., Thilmann, N., Pasiskevicius, V. & Laurell, F. (2014). High-power, single-frequency, continuous-waveoptical parametric oscillator employing avariable reflectivity volume Bragg grating. Optics Express, 22(24), 29907-29913
Open this publication in new window or tab >>High-power, single-frequency, continuous-waveoptical parametric oscillator employing avariable reflectivity volume Bragg grating
2014 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 22, no 24, p. 29907-29913Article in journal (Refereed) Published
Abstract [en]

A continuous-wave singly-resonant optical parametric oscillator (SRO) with an optimum extraction efficiency, that can be adjusted independent of the pump power, is demonstrated. The scheme employs a variable-reflectivity volume Bragg grating (VBG) as the output coupler of a ring cavity, omitting any additional intra-cavity elements. In this configuration, we obtained a 75%-efficient SRO with a combined signal (19 W @ 1.55 mu m) and idler (11 W @ 3.4 mu m) output power of 30 W.

Keywords
Optical parametric oscillators, Reflection, Continuous waves, Extraction efficiencies, Intracavities, Output couplers, Single-frequency, Singly-resonant optical parametric oscillators, Volume bragg grating (VBG), Volume Bragg gratings
National Category
Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
urn:nbn:se:kth:diva-156407 (URN)10.1364/OE.22.029907 (DOI)000345770500058 ()2-s2.0-84914691669 (Scopus ID)
Funder
Swedish Research Council
Note

QC 20141203

Available from: 2014-11-27 Created: 2014-11-27 Last updated: 2019-09-04Bibliographically approved
Tjörnhammar, S., Zeil, P., Pasiskevicius, V. & Laurell, F. (2014). Iterative numerical investigation of the thermal dephasing process in second harmonic generation in bulk periodically-poled crystals. In: 6th EPS-QEOD Europhoton Conference, "Solid State, Fibre, and Waveguide Coherent Light Sources": Europhysics Conference Abstract Volume 38 E. Paper presented at 6th EPS-QEOD EUROPHOTON CONFERENCE "Solid State, Fibre, and Waveguide Coherent Light Sources" Neuchatel, Switzerland, 24-29 August 2014 (pp. 39-39).
Open this publication in new window or tab >>Iterative numerical investigation of the thermal dephasing process in second harmonic generation in bulk periodically-poled crystals
2014 (English)In: 6th EPS-QEOD Europhoton Conference, "Solid State, Fibre, and Waveguide Coherent Light Sources": Europhysics Conference Abstract Volume 38 E, 2014, p. 39-39Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

We numerically study the detrimental effect of thermal dephasing during second-harmonic generation in quasi-phase matched materials by iteratively solving the coupled wave eqations and the heat transfer equation.The variation of different experimental conditions, such as external phase-match temperature and focussing conditions is discussed.

National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-154731 (URN)2-914771-89-4 (ISBN)
Conference
6th EPS-QEOD EUROPHOTON CONFERENCE "Solid State, Fibre, and Waveguide Coherent Light Sources" Neuchatel, Switzerland, 24-29 August 2014
Note

QC 20150223

Available from: 2014-10-27 Created: 2014-10-27 Last updated: 2015-03-30Bibliographically approved
Zeil, P., Thilmann, N., Pasiskevicius, V. & Laurell, F. (2014). Pump threshold optimization of a continuous-wave optical parametric oscillator using avariable-reflectivity volume Bragg grating. In: : . Paper presented at 6th EPS-QEOD Europhoton Conference 2014, University of Neuchatel Neuchatel, Switzerland, 24-29 August 2014.
Open this publication in new window or tab >>Pump threshold optimization of a continuous-wave optical parametric oscillator using avariable-reflectivity volume Bragg grating
2014 (English)Conference paper, Poster (with or without abstract) (Refereed)
National Category
Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
urn:nbn:se:kth:diva-157665 (URN)
Conference
6th EPS-QEOD Europhoton Conference 2014, University of Neuchatel Neuchatel, Switzerland, 24-29 August 2014
Note

QC 20150409

Available from: 2014-12-11 Created: 2014-12-11 Last updated: 2015-04-09Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-7231-5181

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