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12 October 2010 OP-GaAs OPO pumped by 2μm Q-switched lasers: Tm;Ho:silica fiber laser and Ho:YAG laser
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Improvement in hybrid vapour phase epitaxy growing techniques of quasi-phase-matched orientation-patterned GaAs (OP-GaAs) allows larger sample thickness and permits efficient operation as a mid-infrared optical parametric oscillator at Watt-level average output powers [1-3]. Especially its low absorption loss (- 0.01 cm-1), its laser damage threshold comparable to ZGP (- 2 J/cm2) combined with a large nonlinear coefficient, a good thermal conductivity, excellent mechanical properties, and a wide transparency range (0.9-17 μm) are suitable properties for efficient non-critical phase matched OPOs. As there is no natural birefringence in GaAs, phase matching is independent of polarization and propagation direction, offering the ability to pump OP-GaAs with a variety of polarization states. Thus, even unpolarized or poorly polarized sources like simple fiber lasers have been efficiently used as pump sources [4-5]. The paper discuss the best OP-GaAs OPO results achieved, to our knowledge, using a Q-switched 2.09 μm Ho:YAG laser as pump source as well as results obtained with an OP-GaAs OPO directly pumped by a 2.09 μm Q-switched Tm,Ho:silica fiber laser. With a 2.09 μm Q-switched Ho:YAG fiber laser pump source up to 2.9 W of average output power was achieved at 20 kHz repetition rate, 3.9 W at 40 kHz and 4.9 W at 50 kHz. With a 2.09 μm Q-switched Tm3+,Ho3+:silica fiber laser pump source, up to 2.2 W of average output power was achieved at 40 kHz repetition rate, 1.9 W at 60 kHz and 1.3 W at 75 kHz in the mid-infrared range.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
C. Kieleck, A. Hildenbrand, M. Eichhorn, D. Faye, E. Lallier, B. Gérard, and S. D. Jackson "OP-GaAs OPO pumped by 2μm Q-switched lasers: Tm;Ho:silica fiber laser and Ho:YAG laser", Proc. SPIE 7836, Technologies for Optical Countermeasures VII, 783607 (12 October 2010);

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