Abstract
We show both theoretically and experimentally that interference fringe signals can always be suppressed to improve the signal-to-noise ratio, provided that the modulation frequency is of the order of the absorption linewidth or higher. Suppression of optical interference fringes by more than 1 order of magnitude and signal-to- noise ratio enhancement of more than 13 dB is demonstrated by use of a proper choice of laser modulation frequency. A further fringe reduction of 10 dB is possible by adjustment of the local oscillator phase.
© 1995 Optical Society of America
Full Article | PDF ArticleMore Like This
Joel A. Silver and Alan C. Stanton
Appl. Opt. 27(10) 1914-1916 (1988)
Nee-Yin Chou, Glen W. Sachse, Liang-Guo Wang, and Thomas F. Gallagher
Appl. Opt. 28(23) 4973-4975 (1989)
J. M. Smith, J. C. Bloch, R. W. Field, and J. I. Steinfeld
J. Opt. Soc. Am. B 12(6) 964-969 (1995)