液体相位共轭技术在高重复频率双程放大器中的应用
High pulse repetition rate double-pass amplifier with the liquid phase conjugating mirror
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摘要: 采用丙酮液体作为相位共轭镜改善光束质量,实验研究了高重复频率二极管泵浦Nd:YAG双程放大器中液体SBS相位共轭技术的应用。结果表明:采用光束扫描方式,较明显地减小了液体介质热效应。激光器在重复频率400 Hz、注入能量40 mJ时,反射率达到65%。激光器使用SBS相位共轭镜后光束质量由2.3倍衍射极限提高到1.3倍衍射极限,激光脉宽由23 ns压缩到5 ns。Abstract: Phase conjugation technology with liquid CH3COCH3 as medium to improve beam quality in double-pass amplifier laser system is experimentally investigated. The results operating at 400 Hz repetition rate show that the thermal effects of the liquid medium can be effectively reduced when the beam scanning system is adopted. A maximum SBS reflectivity of 65% by using liquid CH3COCH3 is achieved at 400 Hz. In addition, the pulse width of laser has been compressed to 5 ns, and the beam quality has been improved.
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Key words:
- lasers /
- phase conjugating mirror /
- high repetition rate /
- liquid sbs medium /
- thermal effect
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