Optimization of compensation for high spatial frequency in distorted wavefront using optical phase conjugation

A method is proposed to optimize the recording structure of the photorefractive volume grating to compensate high spatial frequency in the distorted wavefront by optical phase conjugation. Based on the coupled-wave equation, the diffraction efficiency of the recorded grating formed by the scattered beams in different recording structures is simulated. The theoretical results show that the recorded modulations with high spatial frequency can be significantly improved in the small recording angle. In the experiment, three recording structures with the recording angles of 7.5 degrees, 30 degrees, and 45 degrees are chosen to verify the compensation effect. Compared with the reconstructed image in the large recording angle of 45 degrees, the signal to noise ratio of the image recorded at 7.5 degrees increases to 3.2 times of that at 45 degrees.