20.8 W 9.9 mJ 室温紧凑型<styled-content style-type="number">1030</styled-content> nm纳秒激光器

20.8 W 9.9 mJ 室温紧凑型1030 nm纳秒激光器

摘要: 报道了一种室温下运行的高功率、高光束质量Yb:YAG激光振荡器。该激光器采用了中等掺杂（Yb³⁺原子分数2.0 at%）的Yb:YAG棒状晶体，并使用准连续输出的光纤耦合模块进行端面泵浦，成功研制出具备48 W高光束质量微秒输出能力的端泵激光器。通过设计优化谐振腔的腔型结构，在100 Hz重复频率下获得了22 W的准连续线偏振微秒激光输出，光光效率达到47.4%，斜效率为53.5%，光束质量M²为1.22。通过优化泵浦光斑尺寸并使用声光调Q模块，实现了20.8 W的纳秒脉冲输出，对应单脉冲能量为9.9 mJ，脉冲宽度为23.9 ns，光束质量M²为1.39。整个激光系统采用紧凑化设计，光学部分尺寸仅为250 mm × 200 mm × 80 mm。

Abstract: This paper reports on a room-temperature Yb:YAG rod laser with high power and high beam quality. The oscillator utilizes a moderately doped Yb:YAG rod crystal (Yb³⁺ 2.0 at atomic fraction of %) and employs quasi-continuous-wave end-pumping. At a repetition rate of 100 Hz, it achieved a 22 W linearly polarized laser output, with a slope efficiency of 53.5% and an optical-to-optical efficiency of 47.4%, while maintaining a beam quality of M² = 1.22. Using acousto-optic Q-switching, the laser produced a 20.8 W pulse output with an energy of 9.9 mJ and a beam quality of M² = 1.39, demonstrating the laser's capability for high-repetition-rate Q-switched pulse output.