Tsutomu SATO, Hirofumi FUJIWARA and Kazuo NAKAGAWA

Department of Materials Science and Engineering, Muroran Institute of Technology, 27-1 Mizumoto, Muroran, 050-8585 Japan

(Received June 13, 2003; Accepted October 20, 2003)

The contribution of absorptive and refractive gratings to a mixed hologram is investigated by means of two-wave coupling technique by moving a hologram. Polyvinyl alcohol films doped with xanthene-dyes such as erythrosin B, eosin Y, uranin and fluorescein which absorb an argon-ion laser light of 488 nm and 515 nm are used as hologram-recording materials in our experiment. A simple model of the two-level one-step photo-bleaching well explains the growth of an absorptive grating and the refractive index and also the working wavelength dependence of growth of the refractive grating in the xanthene-dye-doped films.

Key words: mixed hologram, phase of diffracted wave, absorptive grating, refractive grating, two-wave coupling by moving hologram, xanthene-dyes