The Experimental Research On Off-axis Digital Holography Recording And Reconstruction Based On MATLAB Simulation

This article first analyzes the two-step imaging process in optical holography, namely wavefront recording and wavefront reconstruction. According to the relationship of the four diffraction components in the spatial spectrum of the off-axis digital holography diffraction process, the minimum angle is derived between the object light and the reference light of the off-axis digital holography. According to the sampling theorem, the maximum angle is derived between the object light and the reference light in off-axis digital holography. The mathematical derivation of holography algorithm is introduced based on these foundations. In the experiment, a light path system was used to study the method of eliminating zero order in off-axis digital holograms by recording reference light at different angles to the X-axis or Y-axis, while improving the image resolution of off-axis digital holographic reconstruction. Secondly, the off-axis digital holographic recording optical path was constructed to eliminate zero order holographic imaging by comparing the reference light with different angles of the X-axis or Y-axis. The current Fresnel approximation reconstruction algorithm is analyzed and verified by simulation. The results indicate that the S-FFT (Single-Fast Fourier Transform) reconstructed image undergoes periodic changes from overlap to separation, and then from separation to overlap.