[OPTICAL REVIEW Vol. 1, No. 2 (1994) 237-240]

Implementation of Two-Dimensional Lock-In Detector Array Using BSO Spatial Light Modulator

Yukihisa OSUGI,1 Youichi BITOU2 and Takumi MINEMOTO2

1Corporate Research and Development Group, NGK Insulators, Ltd., Suda-cho, Mizuho-ku, Nagoya, 467 Japan, 2Department of Instrumentation Engineering, Faculty of Engineering, Kobe University, Rokkodai, Nada-ku, Kobe, 657Japan

(Accepted September 29, 1994)

A BSO spatial light modulator (BSO-SLM) was operated applying ac voltage. The basic properties of the operation correspond to those in a usual lock-in detector and a 2-dimensional lock-in detector array (2D-LOCK-IN) was implemented by the optical modulator. The properties of the 2D-LOCK-IN using a BSO-SLM were investigated theoretically and experimentally. As an application of the 2D-LOCK-IN, oscillating amplitude were observed on simple vibrating objects.

Key words : optical processing, spatial light modulator, laser, lock-in detector, vibration