激光技术
激光技術
격광기술
LASER TECHNOLOGY
2014年
4期
574-578
,共5页
激光光学%相位恢复%相位测量%Gerchberg-Saxton算法
激光光學%相位恢複%相位測量%Gerchberg-Saxton算法
격광광학%상위회복%상위측량%Gerchberg-Saxton산법
laser optics%phase retrieval%phase measurement%Gerchberg-Saxton algorithm
为了避免传统Gerchberg-Saxton算法易陷入局部极值、而不能达到理想精度的问题，采用一种简单的循环方法，通过增加信息量，即增加一个平面，使算法能够比较有效地跳出局部极值，并进行了模拟计算。在光瞳平面振幅未知的情况下，利用焦平面或附近位置处的光强信息，对光瞳平面相位和振幅分布进行了恢复。结果表明，新算法达到较高的相位复原精度，进而实现了任意位置处光场的准确复原。
為瞭避免傳統Gerchberg-Saxton算法易陷入跼部極值、而不能達到理想精度的問題，採用一種簡單的循環方法，通過增加信息量，即增加一箇平麵，使算法能夠比較有效地跳齣跼部極值，併進行瞭模擬計算。在光瞳平麵振幅未知的情況下，利用焦平麵或附近位置處的光彊信息，對光瞳平麵相位和振幅分佈進行瞭恢複。結果錶明，新算法達到較高的相位複原精度，進而實現瞭任意位置處光場的準確複原。
위료피면전통Gerchberg-Saxton산법역함입국부겁치、이불능체도이상정도적문제，채용일충간단적순배방법，통과증가신식량，즉증가일개평면，사산법능구비교유효지도출국부겁치，병진행료모의계산。재광동평면진폭미지적정황하，이용초평면혹부근위치처적광강신식，대광동평면상위화진폭분포진행료회복。결과표명，신산법체도교고적상위복원정도，진이실현료임의위치처광장적준학복원。
To avoid the problem that traditional Gerchberg-Saxton ( GS ) algorithm was easy to get into a partial extremum and could not achieve the desired accuracy , a simple circulatory GS algorithm was used by increasing the amount of information, in another words , increasing one plane so that the GS algorithm could get out of the partial extremum effectively.After the simulative calculation, the phase and amplitude distribution of pupil plane was recovered by the intensity information of the focal plane or nearby position although the amplitude of pupil plane was unknown .The results show that the new algorithm can reach higher accuracy of phase retrieval and lead to precise retrieval of optical field on any planes.
