Frontiers in Physics (Apr 2024)

Efficient degenerate middle infrared ZGP-OPO pumped by an electro-optically Q-switched Tm:YAP laser

  • Wantian Dai,
  • Yu Ding,
  • Yu Ding,
  • Tongyu Liu,
  • Tongyu Liu,
  • Yuwei Zhao,
  • Yuwei Zhao,
  • Jia Gao,
  • Jia Gao,
  • Chen Zhao,
  • Chen Zhao

DOI
https://doi.org/10.3389/fphy.2024.1390115
Journal volume & issue
Vol. 12

Abstract

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In this paper, we demonstrated an efficient degenerate middle infrared (mid-IR) ZGP-OPO that is pumped by an electro-optically Q-switched diode-pumped Tm:YAP laser. The Tm:YAP laser, operating at a repetition rate of 1 kHz, produced a peak pulse energy of 9.66 mJ at 1.94 μm and a minimum pulse width of 25 ns. Utilizing the Tm:YAP laser as the pump source, a peak average output power of 3.14 W at 3.88 μm was achieved in the degenerate ZGP-OPO with an incident Tm power of 9.4 W, resulting in a slope efficiency of 62.7% and an optical conversion efficiency of 33.4%. The minimum pulse width was measured at 21 ns, leading to a peak power of 149.5 kW. Additionally, the beam quality factor of the degenerate mid-IR ZGP-OPO was evaluated to be approximately 2.7 at the maximum output power level.

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