Compensation of distorted wave front using ultra-thin mirror with very large aperture
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摘要: 针对低频波前对光束质量的影响，优化设计了一个口径为300 mm、半径与厚度比为20的薄型光学镜面，被用来对低频随机畸变波前进行补偿，并详细分析了补偿前后的光束质量变化。结果表明：无论是低频随机相位空间尺度参数变化，还是低频相位振幅参数发生改变，低频畸变经过补偿后，畸变波前明显变小，相位梯度在整个空间周期内都降低，远场强度的峰值增加，能量更集中，且能量集中度最高提高约50%。Abstract: Because of low frequency distorted wave front impacting on beam quality, a thin mirror with a diameter of 300 mm and a ratio of radius to thickness of 20 is optimized in order to compensate the distorted wave front. Meanwhile, the far field beam quality before and after compensating distorted wave front is discussed in detail. The analysis results show that the amplitude of the phase decreases obviously, the phase gradient reduces during the whole spatial period, the peak of far field intensity increases, the power focusability of focal spot is improved greatly and the power focusability can increase by as much as 50% compared with the results before compensation whether the space scale parameter of the low frequency phase is altered or the amplitude of the phase varies.
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Key words:
- thin mirror /
- distorted wave front /
- compensation mirror /
- power focusability /
- one-dimension model
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