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Efficient 1 µm Laser Emission of Czochralski-Grown Nd:LGSB Single Crystal

1
National Institute for Laser, Plasma and Radiation Physics, Laboratory of Solid-State Quantum Electronics, Atomistilor 409, Magurele 077125, Ilfov, Romania
2
Doctoral School of Physics, University of Bucharest, Faculty of Physics, Magurele 077125, Ilfov, Romania
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(12), 2005; https://doi.org/10.3390/ma12122005
Received: 22 May 2019 / Revised: 18 June 2019 / Accepted: 19 June 2019 / Published: 22 June 2019
(This article belongs to the Special Issue Photonic Materials and Devices)
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Abstract

A 5.0-at.% Nd-doped La0.64Gd0.41Sc2.95(BO3)4 (Nd:LGSB) borate laser crystal was successfully grown by the Czochralski method, for the first time to our knowledge. The spectroscopic properties of the grown crystal are discussed and 1 µm laser emission, under end-pumping with a fiber-coupled diode laser at 807 nm, is reported. A c-cut Nd:LGSB medium yielded 1.35 W continuous-wave output power at 0.63 overall optical-to-optical efficiency, with respect to the absorbed pump power, together with the high 0.68 slope efficiency. With an a-cut Nd:LGSB sample, 0.81 W output power at 0.52 optical-to-optical efficiency was obtained. The laser emission performances under quasi-continuous wave pumping are presented as well, for both c-cut and a-cut crystals. Passive Q-switching was investigated with a semiconductor saturable absorber mirror (SESAM). Laser pulses with 2.2 µJ energy and 32.8 ns durations were recorded from a-cut Nd:LGSB. The average output power reached 0.36 W at 1.55 W absorbed pump power. Passive mode-locking with SESAM was achieved in a long Z-type resonator. Ultrashort pulses with 0.19 W average power, 1.63 nJ energy, and 1.43 ps pulse duration, at 118 MHz repetition rate, are demonstrated for the a-cut Nd:LGSB medium. View Full-Text
Keywords: Nd-doped borate crystals; end pumping; passive Q-switching; SESAM mode-locking Nd-doped borate crystals; end pumping; passive Q-switching; SESAM mode-locking
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Brandus, C.-A.; Hau, S.; Broasca, A.; Greculeasa, M.; Voicu, F.-M.; Gheorghe, C.; Gheorghe, L.; Dascalu, T. Efficient 1 µm Laser Emission of Czochralski-Grown Nd:LGSB Single Crystal. Materials 2019, 12, 2005.

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