Coherent noise suppression of phase images in digital holography by rotating illuminating light

A method based on superposition of multiple reconstructed images is presented for coherent noise reduction of the phase image in digital holography. The proposed method obtains multiple off-axis holograms upon rotation of the illuminating light in the polar plane under a constant azimuthal angle. Both the tilt factor and lateral shift of the reconstructed phase distribution are compensated by using the phase compensation algorithm and digital image registration method respectively. The coherent noise in the synthesized images is significantly suppressed by averaging reconstructed imaging fields. The experimental results and the related statistical evaluation have demonstrated the effectiveness of this approach.