二极管泵浦Nd:YAG板条双通放大器技术研究
Experimental study of double-pass power amplifier
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摘要: 对二极管泵浦Nd:YAG板条双通放大器进行了理论设计和数值计算。在注入能量1 mJ，小信号增益为0.23 cm -1时理论计算结果为双通放大器输出能量为229.8 mJ。实验在10 Hz时获得单脉冲输出能量216 mJ；400 Hz时获得单脉冲输出能量203.4 mJ，光束质量因子小于5，激光脉宽为16.9 ns。实验结果与理论计算基本吻合。用相位共轭镜取代0°全反镜，超高斯镜取代振荡级输出镜，并采用镜面均匀的光学器件可以改善光束质量及光斑均匀性。Abstract: In a double-pass amplifier system, a laser pulse width(FWHM) of l6.9 ns and more than 216 mJ was obtained in the case of 10 Hz repetition frequency. Furthermore, 203.4 mJ per pulse was achieved where the repetition rate is up to 400 Hz. The beam quality factor is no more than 5 in the case and self-oscillating was successfully eliminated in experiments. But the distribution of laser section is asymmetric, and the reason was theoretically analyzed. HR mirror replaced by phase conjugated mirror and ocillating output mirror by sup-Guass mirror can improve the beam quality.
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Key words:
- mopa /
- double-pass amplifier /
- beam quality
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