利用Mach-Zehnder点衍射干涉仪的激光复振幅实时重建方法

Real-Time Complex Amplitude Reconstruction Method Using Mach-Zehnder Point Diffraction Interferometer

在充分利用Mach-Zehnder自参考干涉系统无需设置专门参考光优点的基础上,提出一种激光复振幅实时重建方法.在参考臂和测试臂上分别设置放大倍率为s且互为倒置的望远镜系统,使得经针孔滤波、准直后的参考光被放大s2倍形成波前与振幅(或强度)皆近似于一个平面的理想参考光.研究表明:利用傅里叶分析法从干涉图中便可直接重建待测激光复振幅分布,具有结构简单和测量快速的优点.基于该系统分别对静态和动态输出光场进行复振幅重建实验,并由此求得相应的M2因子,从而验证该方法在复杂光场光束质量实时检测的可行性.

Considering the advantagesof the characteristicssaid as without a special reference wave of MachZehnder point diffraction interference system（MZ-PDI）,a real-time complex amplitude reconstruction method is presented.Two telescopes with the magnification s are placed at the reference arm and test arm in MZ-PDI,respectively.The telescope in one arm is inverted with respect to the other one.The reference wave is enlarged S=s2 times after filteredby thepinhole filter,consequently,both of the reference wavefrontphaseand reference amplitude（or intensity profile）can be approximately seen as a plane and it services as an ideal reference wave.Thenthe complex amplitude of the test beam can be directly extracted from a single interferogram using the Fourier transform fringe analysis method.The proposed method can provide a simple and fast solutionwhile still maintains high accuracy for reconstructing complex amplitude.The experiments of the static and dynamic output optical wave are demonstrated based on the proposed MZ-PDI system,meanwhile the beam quality M2 factor of the test beam are obtained from the reconstructed complex amplitude.The experimental results showed that feasibility of the proposed system for real-time beam characterization of the complex optical beams.