8 ITMP3 / 8éme conférence internationale de photoacoustique et photothermique
J. Phys. IV France 04 (1994) C7-91-C7-94
Probe beam image detection for mode-mismatched dual beam thermal lens spectrometryJ. Shen, A.J. Soroka, M.L. Baesso and R.D. Snook
DIAS, UMIST, P.O. Box 88, Manchester, M60 1QD, U.K.
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.
© EDP Sciences 1994