[OPTICAL REVIEW Vol. 5, No. 3 (1998) 179-184]

A Simple Frequency Lock of Green YAG Laser to Dispersion Line of the Linear Absorption Spectrum of Iodine Molecules Utilizing an Acousto-Optic Frequency Shifter

Shuko YOKOYAMA,1 Toshiyuki YOKOYAMA,2 Tsutomu ARAKI,2 Takahisa HAYASHI3 and Norihito SUZUKI4

1Japan Micro-Optics Co., Fushimiku, Kyoto, 612-0884 Japan, 2Department of Systems and Human Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, 560-8531 Japan, 3Dainippon Screen Mfg. Co., Kamigyou-ku, Kyoto, 610-8585 Japan, 4Department of Precision Engineering, Osaka Electro Communication University, Neyagawa, 572-8530 Japan

(Received January 16, 1998; Accepted March 23, 1998)

Frequency of a 532 nm emission line of a diode-laser-pumped Nd:YAG laser is stabilized by lock of the output line to the linear absorption line of iodine molecules. The stabilization method is very simple utilizing the frequency shift caused with an acousto-optic modulator. The laser frequency was stabilized at the zero-crossing point of the second-derivative of the dispersion curve. Instability obtained by the error signal is affected by the phase-characteristics of detectors, which results in 3*10-8.

Key words : LD-YAG-SHG laser, frequency stabilization, dispersion of iodine molecules, acousto-optic frequency shifter