Probe beam image detection for mode-mismatched dual beam thermal lens spectrometry

J. Shen; A.J. Soroka; M.L. Baesso; R.D. Snook

doi:doi:10.1051/jp4:1994723

Issue		J. Phys. IV France Volume 04, Number C7, Juillet 1994 8th International Topical Meeting on Photoacoustic and Photothermal Phenomena 8 ITMP³ / 8éme conférence internationale de photoacoustique et photothermique


Page(s)		C7-91 - C7-94
DOI		https://doi.org/10.1051/jp4:1994723

8th International Topical Meeting on Photoacoustic and Photothermal Phenomena
8 ITMP³ / 8éme conférence internationale de photoacoustique et photothermique

J. Phys. IV France 04 (1994) C7-91-C7-94
DOI: 10.1051/jp4:1994723

Probe beam image detection for mode-mismatched dual beam thermal lens spectrometry

J. Shen, A.J. Soroka, M.L. Baesso and R.D. Snook

DIAS, UMIST, P.O. Box 88, Manchester, M60 1QD, U.K.

Abstract
A model for CW induced mode-mismatched dual-beam thermal lens spectrometry using the whole probe beam profile has been developed. This model quantitatively describes the intensity distribution before and after the thermal lens has been created. It is considered that after passing through the thermal lens, the TM₀₀ Gaussian probe beam becomes the superposition of several Gaussian beams of different parameters. A compact mathematical expression was obtained, which allows absolute measurements of opthothermal properties of transparent samples. Experimental proofs have been displayed.