[OPTICAL REVIEW Vol. 6, No. 5 (1999) 433-438]
Interpolation Method for Computer-Generated Holograms Using Random Phase Technique
Nobukazu YOSHIKAWA and Toyohiko YATAGAI
Tsukuba Advanced Research Alliance, Institute of Applied Physics, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki, 305-8573 Japan
(Received November 4, 1998; Accepted June 12, 1999)
An interpolation method for reconstructed images of computer-generated holograms (CGHs) enables one to synthesize CGHs with a large space bandwidth product (SBWP) from CGHs with a small SBWP. The phase information of objects is regarded as constant because the method is based on digital image processing techniques. Therefore, diffraction efficiency is low due to the saturation effect in the recording process. To improve the diffraction efficiency, a random phase technique is employed for the interpolation method to the CGH. Effects of the random phase in the reconstructed image are discussed in several interpolation types. The interpolation method is also applied to a kinoform. Some computer simulations and optical experiments are presented.
Key words : computer-generated hologram, interpolation method, random phase technique, kinoform