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<p>A&#xa0;stable unidirectional operated passively Q‑switched mode-locked Nd:YAG laser based on the double corner-cube-retroreflectors (CCRs) ring cavity with Cr:YAG saturable absorber is demonstrated. The performance was characterized using Cr:YAG saturable absorbers with different initial transmissions (38% and 59%), where a&#xa0;lower transmission was found to promote deeper modulation and more stable temporal profiles for the mode-locked pulses. At a&#xa0;pump repetition rate of 100 Hz, the laser achieved a&#xa0;single-envelope energy of 0.434 mJ and a&#xa0;maximum output energy of 5.86 mJ (pump peak power: 320.4 W). With the variation of the initial transmission of the Cr:YAG, the temporal measurements showed envelope durations of 46 ns and 64 ns, with an intra-envelope pulse spacing of 2.6 ns and 2.9 ns. The system exhibited rapid start-up and maintained stable operation for over 30 min, benefiting from the strong inherent anti-misalignment of the double-CCR design. Experimental results verify that this cavity structure significantly enhances tolerance to both angular and translational alignment errors, while the initial transmission of the saturable absorber provides a&#xa0;direct means to tailor the output pulse characteristics.</p>

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Passively Q-switched mode-locked Nd:YAG laser with Cr:YAG saturable absorber and double-corner-cube-retroreflector cavity

  • 期刊论文

  • 发表日期：

    2026年6月1日

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  • Haitao Jiang,
  • Xianwei Meng,
  • Guanqu Hu

摘要

A stable unidirectional operated passively Q‑switched mode-locked Nd:YAG laser based on the double corner-cube-retroreflectors (CCRs) ring cavity with Cr:YAG saturable absorber is demonstrated. The performance was characterized using Cr:YAG saturable absorbers with different initial transmissions (38% and 59%), where a lower transmission was found to promote deeper modulation and more stable temporal profiles for the mode-locked pulses. At a pump repetition rate of 100 Hz, the laser achieved a single-envelope energy of 0.434 mJ and a maximum output energy of 5.86 mJ (pump peak power: 320.4 W). With the variation of the initial transmission of the Cr:YAG, the temporal measurements showed envelope durations of 46 ns and 64 ns, with an intra-envelope pulse spacing of 2.6 ns and 2.9 ns. The system exhibited rapid start-up and maintained stable operation for over 30 min, benefiting from the strong inherent anti-misalignment of the double-CCR design. Experimental results verify that this cavity structure significantly enhances tolerance to both angular and translational alignment errors, while the initial transmission of the saturable absorber provides a direct means to tailor the output pulse characteristics.