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<p>The direct oscillation of high pulse energy and high average power nanosecond laser is limited by the limited aperture of the gain medium and Q-switched devices. In this Letter, the stable-unstable hybrid resonator with a tapered scraper mirror (TSM) for laser output is selected to overcome the difficulty. The sharp edges of the hollow-square scraper mirror guarantee the safety operation. A 207&#xa0;mJ pulse energy, 500&#xa0;Hz repetition rate, 53.5 ns pulse width laser output is obtained from the hybrid resonator with a 3 times magnification in the unstable direction, corresponding to a 3.87&#xa0;MW peak power. The beam quality in the thickness and width directions of the slab are <i>β</i><sub>x</sub> = 1.23 times and <i>β</i><sub>y</sub> = 1.50 times diffraction limits, respectively. This method provides a potential solution for the generation of high pulse energy and high average power nanosecond laser, and has good potential in the industry use and other scenarios with compactness requirement.</p>

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High Beam Quality 500 Hz, 207 mJ Nanosecond Laser Based on Large Mode Volume Stable-Unstable Hybrid Resonator

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月13日

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  • Tian-Li Yang,
  • Zi-Hao Ning,
  • Jing Yang,
  • Hao Liu,
  • Xue-Peng Li,
  • Yan-Zhong Chen,
  • Hong Xiao,
  • Jing-Yu Li,
  • Xiao-Jun Wang,
  • Zhong-Wei Fan

摘要

The direct oscillation of high pulse energy and high average power nanosecond laser is limited by the limited aperture of the gain medium and Q-switched devices. In this Letter, the stable-unstable hybrid resonator with a tapered scraper mirror (TSM) for laser output is selected to overcome the difficulty. The sharp edges of the hollow-square scraper mirror guarantee the safety operation. A 207 mJ pulse energy, 500 Hz repetition rate, 53.5 ns pulse width laser output is obtained from the hybrid resonator with a 3 times magnification in the unstable direction, corresponding to a 3.87 MW peak power. The beam quality in the thickness and width directions of the slab are βx = 1.23 times and βy = 1.50 times diffraction limits, respectively. This method provides a potential solution for the generation of high pulse energy and high average power nanosecond laser, and has good potential in the industry use and other scenarios with compactness requirement.