Abstract

To decrease laser tube drift, earlier improvements in laser tube construction and other parts were rather complicated.¹ The alignment system presented is simple. When an original laser beam passes through the double-beam coincidence system, it will first split into two beams which are reversed with respect to each other; then the two coincide into one. The drift of the original beam can be compensated in the coincided beam. Some experiments were performed using a vacuum pipe.

© 1985 Optical Society of America