Abstract

A monochromator and computer system has been constructed which measures wavelengths over a limited range with approximate six figure accuracy. Other wavelength measurement devices have been constructed which depend on interferometric methods to measure the wavelength. These devices have proven to work well when the beam quality of the laser to be measured is reasonably good. However when two of these devices of different manufacture were tested on a laser having poor beam quality, both devices yielded erratic readings. This was ascribed to extra fringes produced in the interferometric patterns. To obviate beam quality problems, a wavelength measurement device based on a monochromator was conceived.

© 1985 Optical Society of America