Improved angular multiplexing method with polarization interference for enhancing the resolution of digital holographic image

An improved angular multiplexing method is proposed with polarization interference to enhance the resolution of digital holographic image. Samples are illuminated by using two orthogonally polarized laser beams with different incidence angles as these object beams correspondingly carrying low and high frequency of spatial information. A linearly polarized reference beam with a 45° polarized angle relative to the two object beams is introduced to interfere with object beams and form two resulting sub-holograms simultaneously recording in one frame with more frequency information maintained. The resolution of the reconstructed digital holographic is improved with compensation of the high frequency information. Experimental results show the feasibility and effectiveness of this method.