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

National Institute for Laser, Plasma and Radiation Physics, Laboratory of Solid-State Quantum Electronics, Atomistilor 409, Magurele 077125, Ilfov, Romania
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;
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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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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