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<p>This study proposes a high-power, high-beam-quality 1064&#xa0;nm Nd: YVO<sub>4</sub> laser amplifier that employs self-compensating spherical aberration, based on 878&#xa0;nm and 888&#xa0;nm laser diode end-pumping. Thermal compensation of spherical aberration in the laser crystal is confirmed through wavefront measurement, and the impact of thermal distortion on beam quality is evaluated. The seed laser with an output power of 30&#xa0;W is amplified to 385&#xa0;W by employing a four-stage Nd: YVO<sub>4</sub> amplifier. During amplification, the laser beam quality undergoes deterioration and compensation. When the output power decreased to ~ 350&#xa0;W, the final beam quality factors are 1.21 in the horizontal direction and 1.25 in the vertical direction. The high average output power and near diffraction-limited laser beam demonstrate the potential applications of conventional bulk Nd: YVO<sub>4</sub> crystals in high average power and high brightness laser sources.</p>

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~ 350 W near-diffraction-limited Nd: YVO4 laser amplifier with thermal spherical aberration self-compensation

  • 期刊论文

  • 发表日期：

    2025年5月21日

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  • Yang Liu,
  • Xiaoyan Qiu,
  • Bin Liu,
  • Yuhong Shen,
  • Liying Chen,
  • Junyang Dong,
  • Yiwen Jin,
  • Yichao Peng,
  • Jian Chen,
  • Bingfeng Ju,
  • Chong Liu

摘要

This study proposes a high-power, high-beam-quality 1064 nm Nd: YVO4 laser amplifier that employs self-compensating spherical aberration, based on 878 nm and 888 nm laser diode end-pumping. Thermal compensation of spherical aberration in the laser crystal is confirmed through wavefront measurement, and the impact of thermal distortion on beam quality is evaluated. The seed laser with an output power of 30 W is amplified to 385 W by employing a four-stage Nd: YVO4 amplifier. During amplification, the laser beam quality undergoes deterioration and compensation. When the output power decreased to ~ 350 W, the final beam quality factors are 1.21 in the horizontal direction and 1.25 in the vertical direction. The high average output power and near diffraction-limited laser beam demonstrate the potential applications of conventional bulk Nd: YVO4 crystals in high average power and high brightness laser sources.