[OPTICAL REVIEW Vol. 18, No. 1 (2011) 180-183]
© 2011 The Japan Society of Applied Physics

Optical-Path-Length-Shifting Color Digital Holography

Takashi KAKUE, Mitsuo KUWAMURA, Yuki SHIMOZATO, Tatsuki TAHARA, Yasuhiro AWATSUJI*, Kenzo NISHIO1, Shogo URA, Toshihiro KUBOTA2, and Osamu MATOBA3

Graduate School of Science and Technology, Kyoto Institute of Technology, Kyoto 606-8585, Japan
1Advanced Technology Center, Kyoto Institute of Technology, Kyoto 606-8585, Japan
2Kubota Holography Laboratory Corporation, Uji, Kyoto 611-0042, Japan
3Graduate School of System Informatics, Kobe University, Kobe 657-8501, Japan

(Received May 31, 2010; Revised August 9, 2010; Accepted August 18, 2010)

We propose an in-line color digital holography that can suppress a 0th-order diffraction image and a conjugate image. This technique reconstructs the image of an object from two holograms that are formed at two different distances from the object for each primary color. We numerically simulated the proposed technique and confirmed that it enabled the reconstruction of higher-quality images of an object than the Fresnel transform alone, which is the simplest reconstruction algorithm in digital holography. The effectiveness of the proposed technique was also quantitatively shown by evaluating the reconstructed images using root-mean-square errors. Thus, it was confirmed that the proposed technique was capable of recording and reconstructing both three-dimensional information and color information of an object.

Key words: holography, digital holography, color holography, three-dimensional imaging, color imaging

*E-mail address: awatsuji@kit.ac.jp