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Multi-watt continuous-wave and passively Q-switched Tm:CaYAlO4 micro-lasers

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    0546016 - FZÚ 2022 RIV US eng C - Conference Paper (international conference)
    Chen, M. - Loiko, P. - Yue, Fangxin - Jambunathan, Venkatesan - Lucianetti, Antonio - Mocek, Tomáš - Serres, J.M. - Aguilo, M. - Diaz, F. - Park, T.G. - Bae, J.E. - Rotermund, F. - Xu, X.D. - Xu, J. - Day, S.B. - Chen, Z.Q. - Griebner, U. - Petrov, V. - Mateos, X. - Major, A.
    Multi-watt continuous-wave and passively Q-switched Tm:CaYAlO4 micro-lasers.
    Solid State Lasers XXIX: Technology and Devices. Bellingham: SPIE, 2020 - (Clarkson, W.; Shori, R.), č. článku 1125927. Proceedings of SPIE, 11259. ISBN 978-1-5106-3282-0. ISSN 0277-786X.
    [Conference on Solid State Lasers XXIX - Technology and Devices -SPIE LASE. San Francisco (US), 01.02.2020-06.02.2020]
    Institutional support: RVO:68378271
    Keywords : calcium aluminates * thulium lasers * diode-pumping * passive Q-switching * carbon nanotubes
    OECD category: Optics (including laser optics and quantum optics)

    Tetragonal calcium rare-earth aluminates, CaLnAlO4, combine a structural disorder with good thermo-mechanical properties. We report on efficient continuous-wave (CW) and passively Q-switched (PQS) ~2-μm laser operation of a 4 at.% Tm:CaYAlO4 crystal using a compact (6-mm-long) plane-parallel cavity. The pump source was a 791 nm fiber coupled AlGaAs laser diode. The CW output power reached 5.78 W at ~1970 nm with a slope efficiency of 43.6% and a linear laser polarization. Stable PQS operation was achieved using a single-walled carbon nanotube (SWCNT) based transmission-type saturable absorber. The PQS laser generated 2.15 W at ~1945 nm, a record-high average output power for this type of lasers. The best pulse characteristics (energy/duration) were 9.1 μJ /165 ns at a repetition rate of 235 kHz.

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