径向剪切干涉法综合诊断光束质量研究
Laser beam quality diagnosis with radial shearing interferometry
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摘要: 为了解决高功率激光装置光束质量诊断系统的自验证问题，研究了基于空间相位调制的径向剪切干涉法综合诊断光束质量的实验应用。该方法理论上只需一台干涉仪且从单幅干涉图中获取光束的近场、相位和远场分布信息。实验结果表明，目前可以得到高分辨率的相位分布，由测量近场和相位恢复出的远场同CCD直接测量得到的远场形态相同，环围能量比曲线相当吻合，不足之处在于只能提取近场较低空间频率成分，还达不到CCD直接测量的空间分辨水平。Abstract: Beam quality measurement is very important for high power laser facility. It ensures the facility work in a safe state and offers parameters to beam control system at the same time .Using radial shearing interferometer (RSI) based on spatial phase modulation combined diagnostic phase, near field and far field in experiment. It is found that this method can get high spatial resolution phase information, and that the power in bucket (PIB) curve of far field measured by RSI agrees very well with that by CCD. The only problem is that high resolution near field can't be obtained with RSI now.
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Key words:
- beam quality /
- radial shearing interferometer /
- near field /
- far field /
- phase
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