Continuous wave laser wavelength measurement using the travelling Michelson interferometer

The general design, operating principles, and accuracy limitations of cw laser wavemeters based on the Michelson interferometer are discussed. Device construction and operating practicalities are illustrated by reference to an automatic system built to monitor the wavelength of a Coherent 599-21 single-mode dye laser.     

A simple wavemeter with crossed dispersion

A simple wavemeter has been developed by crossing the dispersions of a conventional monochromator and a Fabry-Perot interferometer. The interference pattern is scanned by a linear image sensor and processed by a microcomputer to determine the wavelength of cw laser sources with a better than 0.02 Å accuracy even when the sources have more than one spectral peak.