Zhang Jiayu, Li Jiatong, Ma Tiejun, Huang Shengjun, Liang Runze, Jia Chunyan, Ye Shuai, Xia Jinbao, Yao Bo, Nie Hongkun, He Jingliang, Zhang Baitao
Opt Express. 2025 Apr 21;33(8):17325-17333. doi: 10.1364/OE.561479.
A megawatt (MW) peak power, tunable repetition rate nanosecond (ns) laser system based on a quasi-continuous wave (QCW) laser diode (LD) end-pumped master oscillator power amplifier (MOPA) structure was demonstrated. A 1064 nm electro-optically Q-switched Nd:YVO laser was used as the seed source, generating a pulse duration of 4.6 ns, a single pulse energy of 530 μJ, a repetition rate of 1 kHz, and beam quality factors of = 1.38 and = 1.20. After the two-stage QCW end-pumped Nd:YVO amplifier, the single pulse energy was boosted to 16.58 mJ, the pulse duration was shortened to 3.5 ns with a peak power of 4.73 MW, and the beam quality was improved to ≤1.12. The repetition rate was adjustable by using an electro-optic pulse picker while maintaining the repetition rate of the seed laser unchanged, and thus was beneficial for improving the reliability of the output pulsed laser. Furthermore, the gain of QCW end-pumped amplifiers was theoretically estimated using a modified Frantz-Nodvik equation model, the theoretical results were great well with the experimental results.
展示了一种基于准连续波（QCW）激光二极管（LD）端面泵浦主振荡功率放大器（MOPA）结构的兆瓦（MW）峰值功率、可调重复频率纳秒（ns）激光系统。采用1064nm电光调Q Nd:YVO4激光器作为种子源，产生的脉冲宽度为4.6ns，单脉冲能量为530μJ，重复频率为1kHz，光束质量因子M2x = 1.38和M2y = 1.20。经过两级QCW端面泵浦Nd:YVO4放大器后，单脉冲能量提升至16.58mJ，脉冲宽度缩短至3.5ns，峰值功率为4.73MW，光束质量改善至≤1.12。利用电光脉冲拾取器调节重复频率，同时保持种子激光器的重复频率不变，这有利于提高输出脉冲激光的可靠性。此外，使用修正的Frantz-Nodvik方程模型对QCW端面泵浦放大器的增益进行了理论估算，理论结果与实验结果吻合良好。
