A method to improve the image quality of a digital holographic reconstructed image by means of speckle reduction is proposed. The size and position of the speckles are changed according to the wavelengths to record a digital hologram. By superposing reconstructed images with different wavelengths, the effect of speckle is reduced so that the image quality is improved. Optical experiments are given to confirm the proposed method.
© 2008 Optical Society of America
Original Manuscript: July 31, 2007
Revised Manuscript: January 10, 2008
Manuscript Accepted: January 10, 2008
Published: February 22, 2008
Takanori Nomura, Mitsukiyo Okamura, Eiji Nitanai, and Takuhisa Numata, "Image quality improvement of digital holography by superposition of reconstructed images obtained by multiple wavelengths," Appl. Opt. 47, D38-D43 (2008)