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Abstract <p>The optical properties of the nonlinear crystals BaGa<sub>4</sub>S<sub>7</sub>, BaGa<sub>2</sub>GeS<sub>6​</sub> and Ba<sub>2</sub>Ga<sub>8</sub>GeS<sub>16</sub> were examined. The study covers transparency and tuning range for pumps at 1.064, 1.5, 1.85 and 2.09&#xa0;μm, as well as the laser-induced damage threshold (LIDT) measured at ~2 μm with a 1 kHz repetition rate using the R-on-1 method. The study has demonstrated that the crystals exhibit a high LIDT of around 5.8–6.4 J/cm<sup>2</sup>. The combination of a high damage threshold and a broad transparency range of up to 12 μm suggests that sulfur-containing barium chalcogenide crystals hold promise for the development of widely tunable high-energy pulsed radiation sources for various applications, such as medical laser surgery and ablation.</p>

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A Comparative Study of BaGa4S7, BaGa2GeS6, and Ba2Ga8GeS16 Nonlinear Crystals for Optical Parametric Oscillators Pumped at 1 or 2 μm

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • A. A. Boyko,
  • S. E. Sere,
  • E. Yu. Erushin,
  • M. V. Vostrikova,
  • N. Yu. Kostyukova,
  • G. S. Shevyrdyayeva,
  • D. V. Badikov

摘要

Abstract

The optical properties of the nonlinear crystals BaGa4S7, BaGa2GeS6​ and Ba2Ga8GeS16 were examined. The study covers transparency and tuning range for pumps at 1.064, 1.5, 1.85 and 2.09 μm, as well as the laser-induced damage threshold (LIDT) measured at ~2 μm with a 1 kHz repetition rate using the R-on-1 method. The study has demonstrated that the crystals exhibit a high LIDT of around 5.8–6.4 J/cm2. The combination of a high damage threshold and a broad transparency range of up to 12 μm suggests that sulfur-containing barium chalcogenide crystals hold promise for the development of widely tunable high-energy pulsed radiation sources for various applications, such as medical laser surgery and ablation.