Linear relations have been observed between the reciprocal of the noise ratio and the reciprocal of the output power of the He–Cd laser as well as between the noise ratio and the net gain within the laser cavity. By a feedback method with an acoustooptic modulator in the laser cavity at the Brewster angle for low optical loss, a stable laser with high power output and low noise has been obtained. The noise ratio and the output power are 0.8% and 33 mW, respectively, at 4416 Å.
© 1983 Optical Society of America
Y. G. Tseng, J. L. Jiang, J. H. Lu, and M. S. Chiu, "Noise of He-Cd laser and its suppression," Appl. Opt. 22, 2484-2486 (1983)