Abstract

A multimode laser in frequency-modulation spectroscopy gives a signal that is broader than the absorption line by an amount that is determined by how sharp the edges of the laser profile are, not by the total bandwidth of the laser. We have experimentally demonstrated that one can therefore obtain frequency-modulation signals that are narrower than the total bandwidth of the laser.

© 1992 Optical Society of America

Theoretical modeling of multimode laser frequency-modulation spectroscopy

James M. Supplee and Edward A. Whittaker
J. Opt. Soc. Am. B 8(4) 719-725 (1991)

Frequency-modulation spectroscopy with a pulsed dye laser: experimental investigations of sensitivity and useful features

N. H. Tran, R. Kachru, P. Pillet, H. B. van Linden van den Heuvell, T. F. Gallagher, and J. P. Watjen
Appl. Opt. 23(9) 1353-1360 (1984)

Frequency modulation and wavelength modulation spectroscopies: comparison of experimental methods using a lead-salt diode laser

David S. Bomse, Alan C. Stanton, and Joel A. Silver
Appl. Opt. 31(6) 718-731 (1992)

Frequency-modulation spectroscopy for trace species detection: theory and comparison among experimental methods

Joel A. Silver
Appl. Opt. 31(6) 707-717 (1992)

High-resolution absorption measurements by use of two-tone frequency-modulation spectroscopy with diode lasers

Viacheslav G. Avetisov and Peter Kauranen
Appl. Opt. 36(18) 4043-4054 (1997)