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70-W average-power doubly resonant optical parametric oscillator at 2 μm with single KTP

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Abstract

We have demonstrated a high-power intra-cavity-pumped doubly resonant optical parametric oscillator (OPO) at 2 μm with single-type II phase-matched KTP. A linearly polarized Q-switched solid-state Nd:YAG laser was used as the intra-cavity pump source, of which the output power and beam quality were improved by cascading two laser rods for compensating the thermal birefringence as well as by placing double acoustic-optical Q-switches orthogonally, and the output power of the doubly resonant OPO was studied versus the temperature of KTP and the repetition rate of the Q-switch. The output power was insensitive to the temperature of KTP in a wide range, and 70-W average power was obtained at 2 μm with the repetition rate of 5 kHz. The stability of the OPO laser was measured to be <3.5 % root mean square at the output power of 70 W for 400 s.

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Authors and Affiliations

  1. School of Physics and Nuclear Energy Engineering, Beihang University, Beijing, 100191, China

    Qianjin Cui, Xiaowen Shu, Xiaoyun Le & Xiaofu Zhang

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  1. Qianjin Cui
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  2. Xiaowen Shu
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  3. Xiaoyun Le
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  4. Xiaofu Zhang
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Correspondence to Xiaofu Zhang.

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Cui, Q., Shu, X., Le, X. et al. 70-W average-power doubly resonant optical parametric oscillator at 2 μm with single KTP. Appl. Phys. B 117, 639–643 (2014). https://doi.org/10.1007/s00340-014-5877-z

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  • DOI: https://doi.org/10.1007/s00340-014-5877-z

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