Measurement of phase distribution for phase object based on optical scanning holography

In order to measure phase distribution of phase object, a method based on optical scanning holography was proposed. Different from traditional methods greatly, optical scanning holography based on coherent mode was adopted. By using pinhole detector, the phase information of the measured phase object was recorded. And then, the object's phase information can be reconstructed by inversion reconstruction algorithm. The working principle and reconstruction result were demonstrated theoretically and simulated numerically. The influence of pinhole on measurements of phase distribution was analyzed in detail, when non-ideal pinhole was used in recording and reconstruction stages. The results show the validity and correctness of the method proposed, and reasonable measuring results have been achieved.