Doppler-free spectroscopy

Doppler-free spectroscopy

[däp·lər ‚frē spek′träs·kə·pē]
(spectroscopy)
Any of several techniques which make use of the intensity and monochromatic nature of a laser beam to overcome the Doppler broadening of spectral lines and measure their wavelengths with extremely high accuracy.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.