激光束畸变波前高频相位的恢复效果分析

运用逐次逼近迭代法恢复近场畸变波前的高频相位，定量分析了高频相位恢复效果与滤波器截止频率之间的关系，并进一步讨论了近场和远场光强噪声扰动对恢复效果的影响。研究结果表明：随着滤波器截止频率的增大，即对近场波前相位探测器要求的提高，逐次逼近迭代法的高频相位恢复效果会越来越好。此外，高频相位恢复效果随近场或远场光强噪声扰动的增大而变差，其中，近场光强噪声扰动对恢复效果的影响相对较小，而远场光强噪声扰动对恢复效果的影响则明显得多。在实际工作中，为了获得较好的近场高频相位的恢复效果，不仅需要合理地对近场低频相位测量提出要求，而且还必须尽可能减小光强分布测量的误差，特别是尽量减小远场噪声光强的影响。

Analysis on recovery effect of high frequency phase of laser beam with wavefront distortion

The high frequency phase of near-field distorted wavefront is recovered using the successive iteration method. The variation of the recovery effect with the filter cutoff frequency is quantitatively analyzed. The influences of the noise disturbance of near-field and far-field intensities on the recovery effect are discussed. The results show that, with the increasing of the filter cutoff frequency, that is, with the increasing of the measurement requirement for the wavefront phase detector, the recovery effect of high frequency phase by using successive iteration method will be better. In addition, the recovery effect of high frequency phase becomes worse with the increasing of the noise disturbance of near-field or far-field intensity. Specifically, the influence of the noise disturbance of near-field intensity on the recovery effect is relatively small, whereas that of the noise disturbance of far-field intensity is more significant. In practical applications, in order to achieve better recovery effect of the near-field high frequency phase, the demand on the low-frequency phase measurement in near field should be required reasonably, and the measurement errors of the intensity distributions must be as low as possible, especially the influence of far-field noise disturbance should be small enough.