Time-resolved thermal mirror technique with top-hat cw laser excitation.
A theoretical model was developed for time-resolved thermal mirror spectroscopy under top-hat cw laser excitation that induced a nanoscale surface displacement of a low absorption sample. An additional phase shift to the electrical field of a TEM(00) probe beam reflected from the surface displacement was derived, and Fresnel diffraction theory was used to calculate the propagation of the probe beam. With the theory, optical and thermal properties of three glasses were measured, and found to be consistent with literature values. With a top-hat excitation, an experimental apparatus was developed for either a single thermal mirror or a single thermal lens measurement. Furthermore, the apparatus was used for concurrent measurements of thermal mirror and thermal lens. More physical properties could be measured using the concurrent measurements.
Astrath
Francine B
FB
National Research Council of Canada, Institute for Fuel Cell Innovation, 4250 Wesbrook Mall, Vancouver, British Columbia V6T1W5, Canada. AstrathNGC@pq.cnpq.br
Astrath
Nelson G
NG
Shen
Jun
J
Zhou
Jianqin
J
Malacarne
Luis C
LC
Pedreira
P R B
PR
Baesso
Mauro L
ML
D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007834:Lasers; D007909:Lenses; D008962:Models, Theoretical; D013057:Spectrum Analysis / Q000295:instrumentation*; D013817:Thermography / Q000295:instrumentation*