[OPTICAL REVIEW Vol. 4, No. 1B (1997) 246-247]

Raman-Nath Diffraction by Microparticles in Water

Shin-ya IZUMIDA, Kiyohiko HAYASHI and Mitsunori SAITO

Department of Electronics and Informatics, Ryukoku University, Seta, Otsu, 520-21 Japan

(Received July 29, 1996; Accepted October 18, 1996)

In Raman-Nath diffraction by water, the intensities of even order light beams are selectively enhanced by suspension of microparticles. The diffracted beams remain for several seconds even after the ultrasonic oscillation stops. These phenomena are elucidated by assuming the laminar arrangement of micropaticles due to the ultrasonic wave.

Key words : acousto-optic effect, microparticle, ultrasonic wave, diffraction