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  • 1.
    Klemming Eklöf, Finn
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Yu, Zangwei
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Rugeland, Patrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zeil, Peter
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Tjörnhammar, Staffan
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Compact Three-wavelength Fiber Laser for Multi-wavelength Digital Holography2013In: Workshop on Specialty Optical Fiber and Their Applications, 2013Conference paper (Refereed)
    Abstract [en]

    A compact three‐wavelength narrow‐linewidth fiber laser with single pump is demonstrated. The multiple‐wavelength output signal can be effectively employed to synthesize large effective probing wavelength of up to 1.16mm for high depth resolution digital holography.

  • 2.
    Laurell, Fredrik
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Calmano, Thomas
    Mueller, Sebastian
    Zeil, Peter
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Huber, Guenter
    Laser-written waveguides in KTP for broadband Type II second harmonic generation2012In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 20, no 20, p. 22308-22313Article in journal (Refereed)
    Abstract [en]

    Femto-second laser writing was used to fabricate waveguides in a z-cut KTP sample with losses below 0.8 dB/ cm. They were used for efficient, broad bandwidth, Type II birefringent second harmonic generation to the green. The temperature and wavelength bandwidth were, 28 degrees C.cm and 0.85 nm.cm, respectively.

  • 3.
    Laurell, Fredrik
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Seger, Kai
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zeil, Peter
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Tjörnhammar, Staffan
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Volume Bragg grating based lasers2013In: Modern Concepts of Continuous Wave and Pulsed High Power Lasers, 2013Conference paper (Other academic)
    Abstract [en]

    Highly reflecting volume Bragg gratings (VBGs) written in photo-thermo-refractive glass [1], have been successfully employed for spectral control of solid-state lasers [2, 3]. This presentation will review the recent progress in the field.

  • 4.
    Laurell, Fredrik
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Seger, Kai
    Zeil, Peter
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Tjörnhammar, Staffan
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Volume Bragg Grating Based Light Sources2014Conference paper (Refereed)
  • 5.
    Laurell, Fredrik
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zeil, Peter
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Tjörnhammar, Staffan
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Volume Bragg grating controlled light sources2015Conference paper (Refereed)
  • 6.
    Lindberg, Robert
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zeil, Peter
    KTH, School of Engineering Sciences (SCI).
    Malmström, Mikael
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Modelling and Optimizationof High Repetition Rate Fiber Ampliers2015Conference paper (Refereed)
  • 7.
    Lindberg, Robert
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zeil, Peter
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Malmström, Mikael
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Accurate modeling of high-repetition rate ultrashort pulse amplification in optical fibers2016In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 6Article in journal (Refereed)
    Abstract [en]

    A numerical model for amplification of ultrashort pulses with high repetition rates in fiber amplifiers is presented. The pulse propagation is modeled by jointly solving the steady-state rate equations and the generalized nonlinear Schrödinger equation, which allows accurate treatment of nonlinear and dispersive effects whilst considering arbitrary spatial and spectral gain dependencies. Comparison of data acquired by using the developed model and experimental results prove to be in good agreement.

  • 8.
    Lindberg, Robert
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zeil, Peter
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Malmström, Mikael
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Numerical Study and Validation of Ultra-short Pulse Amplification in Fiber Amplifiers at High Repetition Rates2016Conference paper (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.

  • 9.
    Tjörnhammar, Staffan
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zeil, Peter
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Iterative numerical investigation of the thermal dephasing process in second harmonic generation in bulk periodically-poled crystals2014In: 6th EPS-QEOD Europhoton Conference, "Solid State, Fibre, and Waveguide Coherent Light Sources": Europhysics Conference Abstract Volume 38 E, 2014, p. 39-39Conference paper (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.

  • 10.
    Voigtländer, Christian
    et al.
    Friedrich-Schiller-University Jena.
    Zeil, Peter
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Thomas, Jens
    Friedrich-Schiller-University Jena.
    Ams, Martin
    Macquarie University.
    Williams, Robert J.
    Macquarie University.
    Withford, Michael J.
    Macquarie University.
    Tünnermann, Andreas
    Friedrich-Schiller-University Jena.
    Nolte, Stefan
    Friedrich-Schiller-University Jena.
    Fs laser induced apodised Bragg waveguides in fused silica2011In: FRONTIERS IN ULTRAFAST OPTICS: BIOMEDICAL, SCIENTIFIC, AND INDUSTRIAL APPLICATIONS XI / [ed] Heisterkamp, A; Neev, J; Nolte, S, SPIE - International Society for Optical Engineering, 2011, , p. 7Conference paper (Refereed)
    Abstract [en]

    We present apodised Bragg waveguides inscribed in fused silica using a high repetition rate fs laser system. By varying the modulation with a pulse picker, the mean refractive index over the grating length could be kept constant, while the grating strength is varied. Thus, Bragg waveguides with zero crossing Gaussian modulation profile could be demonstrated. The side-lobes were suppressed by about 10 dB compared to a uniform grating.

  • 11.
    Zeil, Peter
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    High-power, single-frequency, continuous-waveoptical parametric oscillator employing avariable reflectivity volume Bragg grating2014In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 22, no 24, p. 29907-29913Article in journal (Refereed)
    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.

  • 12.
    Zeil, Peter
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Tailored fiber lasers and their use in nonlinear optics2015Doctoral 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.

  • 13.
    Zeil, Peter
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    On the tunability of a narrow-linewidth Yb-fiber laser from three- to four-level lasing behaviour2011In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 19, no 15, p. 13940-13948Article in journal (Refereed)
    Abstract [en]

    We report on a tunable multi-watt ytterbium-doped fiber laser bridging the gap from three-level lasing around 980 nm to true four-level lasing at 1100 nm. Wavelength-locking and -tuning was achieved by using an external volume-Bragg grating(VBG) as the cavity end mirror. The results are compared with detailed numerical calculations based on a spectrally resolved rate equation analysis, taking competing emission at other wavelengths into account.

  • 14.
    Zeil, Peter
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Volume Bragg grating controlled fiber lasers2012Conference paper (Other academic)
    Abstract [en]

    In recent years, rare earth doped fiber lasers have experienced remarkable progress in terms of power scaling, warranting their use in numerous research and industry applications. Especially, the rapid rise in output powers an be attributed to the fact that the fiber laser design naturally promotes good thermal handling capabilities, over-all efficiency and exceptional spatial beam qualities. Moreover, the broad fluorescence spectra of the used rare earth gain media allow great flexibility in operating wavelength. However, proper restriction and stabilization of the spectral properties has to keep up with the rapid increase in power levels, without sacrificing the advantages of fiber lasers. In our work, we demonstrate how the implementation of volume-Bragg grating can cater for that demand. We show how this generic technology can be applied to increase the spectral brightness and to permit flexible wavelength-tuning and discuss its advantages and limitations with respect to other approaches.

  • 15.
    Zeil, Peter
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Malmström, Mikael
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Engholm, Magnus
    Mid Sweden University.
    Jelger, Pär
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Jacobsson, Björn
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Extended tunability of narrow-linewidth Yb-fiber laser2011In: 2011 Conference on Lasers and Electro-Optics: Laser Science to Photonic Applications, CLEO 2011, NEW YORK: IEEE , 2011Conference paper (Refereed)
    Abstract [en]

    We report on a tunable ytterbium-doped fiber laser bridging the gap from three-level lasing around 980 nm to true four-level lasing at 1066 nm. Wavelength-locking and -tuning was achieved by an external volume-Bragg grating (VBG). Results are compared with a numerical analysis based on a spectrally resolved rate equation analysis.

  • 16.
    Zeil, Peter
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Efficient spectral control and tuning of a high-power narrow-linewidth Yb-doped fiber laser using a transversally chirped volume-Bragg grating (TCVBG)2012Conference paper (Refereed)
    Abstract [en]

    In this work, we present a high-power (>100 W) tunable Yb-berlaser oscillator. Facile tuning over 2.5 THz of the narrow-band (10GHz) signal was achieved by translating a transversally chirpedvolume-Bragg grating whilst maintaining constant output powerand the polarization.

  • 17.
    Zeil, Peter
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Efficient spectral control and tuning of a high-power narrow-linewidth Yb-doped fiber laser using a transversely chirped volume Bragg grating2013In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 21, no 4, p. 4027-4035Article in journal (Refereed)
    Abstract [en]

    A transversely chirped volume Bragg grating (TCVBG) is used for flexible wavelength-tuning of a high-power (>100 W) tunable Yb-fiber laser oscillator. Continuous tuning over 2.5 THz of the narrow-band (13 GHz) signal was achieved by transversely translating the TCVBG during high-power operation without cavity realignment. The laser operated in a single polarization with a beam propagation factor (M-2) of 1.2. Since the cavity losses remained constant, the high gain fiber laser exhibited excellent power stability (<0.6% relative deviation) over the investigated tuning range. The possibility of considerably increasing the output power and extending the tuning range while maintaining the power stability is discussed.

  • 18.
    Zeil, Peter
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Tunable, high-power, continuous-wave dual-polarization Yb-fiber oscillator2015In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 23, no 13, p. 17450-17455Article in journal (Refereed)
    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.

  • 19.
    Zeil, Peter
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Thilmann, Nicky
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Eciency-optimized, 30W continuous-waveOPO employing a variable re ectivity volume Bragg grating2015Conference paper (Refereed)
  • 20.
    Zeil, Peter
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Thilmann, Nicky
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics.
    Efficiency-optimized, 30 W continuous-wave OPO employing a variable reflectivity volume Bragg grating2014In: Optics InfoBase Conference Papers, OSA - The Optical Society , 2014Conference paper (Refereed)
  • 21.
    Zeil, Peter
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Thilmann, Nicky
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pump threshold optimization of a continuous-wave optical parametric oscillator using avariable-reflectivity volume Bragg grating2014Conference paper (Refereed)
  • 22.
    Zeil, Peter
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Voigtlaender, Christian
    Thomas, Jens
    Richter, Daniel
    Nolte, Stefan
    Femtosecond laser-induced apodized Bragg grating waveguides2013In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 38, no 13, p. 2354-2356Article in journal (Refereed)
    Abstract [en]

    We report on the inscription of apodized Bragg grating waveguides (BGWs) in fused silica using a modulated high repetition rate fs laser system. Tailoring of the grating's coupling strength is facilitated by appropriately substructuring the modulation of the inscribing laser radiation. The proposed alteration delivers an unchanged constant mean refractive index entailing homogeneous guiding properties along the entire waveguide. The BGWs fabricated using a Gaussian apodized modulation profile exhibit a 10 dB improvement in sideband suppression compared to waveguide gratings written with a uniform modulation profile.

  • 23.
    Zeil, Peter
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Frequency doubling in Rb:PPKTP of a high-power, continuous-wave, VBG-locked fiber laser2012Conference paper (Refereed)
  • 24.
    Zeil, Peter
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    High-power Continuous-wave Frequency-doubling in KTiOAsO42013In: Advanced Solid-State Lasers Congress: OSA Technical Digest 2013 / [ed] G. Huber and P. Moulton, Optical Society of America, 2013, p. AM3A.4-Conference paper (Refereed)
    Abstract [en]

    We present efficient single-pass second harmonic generation at 533 nm by frequency doubling a high-power continuous wave fiber laser in KTiOAsO4 (KTA). The scheme provided 11.4 W of green power at a conversion efficiency of 25 %.

  • 25.
    Zeil, Peter
    et al.
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Zukauskas, Andrius
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Tjörnhammar, Staffan
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Canalias, Carlota
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Pasiskevicius, Valdas
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    Laurell, Fredrik
    KTH, School of Engineering Sciences (SCI), Applied Physics, Laser Physics.
    High-power continuous-wave frequency-doubling in KTiOAsO42013In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 21, no 25, p. 30453-30459Article in journal (Refereed)
    Abstract [en]

    High-power continuous-wave generation at 533 nm is demonstrated in bulk periodically poled KTiOAsO4 (KTA) by single-pass frequency doubling of a VBG-locked Yb-doped fiber laser. Absorption characteristic and second harmonic generation (SHG) performance of different KTA samples are studied and compared. The best performing sample catered for 25%-efficient SHG of 13.6 W green light with high spatial beam quality M2 &lt;1.2.

1 - 25 of 25
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