Abstract

A complete and general theoretical description of dual-beam photothermal lensing spectroscopy is given. The results are valid for the most general conditions, that is, for flowing as well as stationary media, and for cw as well as pulsed excitation. For pulsed excitation, the results are valid for arbitrary pulse length. The cw results apply to both modulated as well as unmodulated excitation. Both transverse and collinear geometries are considered.

© 1988 Optical Society of America

Pulsed and cw photothermal phase shift spectroscopy in a fluid medium: theory

B. Monson, Reeta Vyas, and R. Gupta
Appl. Opt. 28(13) 2554-2561 (1989)

Theory of photothermal spectroscopy in an optically dense fluid

Qifang He, Reeta Vyas, and R. Gupta
Appl. Opt. 36(9) 1841-1859 (1997)

Photothermal lensing detection: theory and experiment

Qifang He, Reeta Vyas, and Rajendra Gupta
Appl. Opt. 36(27) 7046-7058 (1997)

Continuous wave photothermal deflection spectroscopy in a flowing medium

Reeta Vyas, B. Monson, Y-X. Nie, and R. Gupta
Appl. Opt. 27(18) 3914-3920 (1988)

Photothermal phase-shift spectroscopy in a flowing medium: experiment

Mahmood Soltanolkotabi and Rajendra Gupta
Appl. Opt. 37(30) 7137-7142 (1998)