相位恢复算法用于光学面形检测的实验研究

 针对相位恢复测量中遇到的初始相位估计、传播因子和收敛判断等问题，以柱面透镜的光学面形为恢复对象，应用迭代相位恢复算法完成了对柱面透镜的光波波前的相位恢复实验，并对实验结果进行了分析。实验结果表明：根据被测对象的光波形态选择最接近的初始相位能够加快收敛速度，避免局部收敛，是保证结果准确与可靠的重要条件。通过对两个记录面上的光强之和做求比值运算计算传播因子 ，并应用到传播公式中，能够消除激光光束本身稳定性与探测器响应均匀性等因素对计算结果的影响。

Optical surface test using phase retrieval method

Aiming at the problems of initial phase estimate, transmission factor α and convergence judgment, a phase retrieval experiment based on iterative method was done by using a cylindrical lens as the testing object. The experiment results showed that inputting an appropriate initial estimate phase was important to accelerate the convergence rate of algorithm, avoid the local convergence and insure the validity of results. In order to eliminate the error caused by the instability of laser and the uniformity of detector, transmission factor α which was calculated by performing the operation of division between the two measured planes- intensities was used in the spectrum propagation formula.