Comparison of three basic reconstruction algorithms in digital holography

Abstract

The common used three reconstruction algorithms, angular spectrum, convolution and Fresnel transform algorithms, all based on the fast-Fourier-transform (FFT) are investigated in digital holography. An off-axis lensless Fourier setup is built. By using USAF test target as micro-object, the recorded digital hologram is numerical reconstructed with these three algorithms. The experimental results show that with convolution algorithm and angular spectrum algorithm, there is an optimal reconstruction distance, with which the whole reconstructed image with the highest resolution can be acquired. When the reconstruction distance is different from the optimal distance, the resolution of the reconstructed image is decreased, particularly for the small distance. Moreover, the restriction for the distance applied by the convolution algorithm is stronger than that by angular spectrum algorithm. The Fresnel transform algorithm is simpler and timeefficiency than other two algorithms. It is the optimal numerical reconstruction algorithm in digital holographic microscopy.