A photoelectric detection scheme for a three-beam interferometer is described. The technique provides an ac measurement signal and improved sensitivity. This method makes use of a relative oscillating motion between the fringes and a slit placed in the interference pattern to produce measurement signals. Certain observations on the form of interference fringes in three-beam interference are also included.
© 1984 Optical Society of America
Mahendra P. Kothiyal and Claude Delisle, "Modified photoelectric setting scheme for a three-beam interferometer," Appl. Opt. 23, 3060-3064 (1984)