Astrath Francine B, Astrath Nelson G, Shen Jun, Zhou Jianqin, Malacarne Luis C, Pedreira P R B, Baesso Mauro L
National Research Council of Canada, Institute for Fuel Cell Innovation, 4250 Wesbrook Mall, Vancouver, British Columbia V6T1W5, Canada.
Opt Express. 2008 Aug 4;16(16):12214-9. doi: 10.1364/oe.16.012214.
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.
针对在平顶连续波激光激发下诱导低吸收样品产生纳米级表面位移的时间分辨热镜光谱，开发了一种理论模型。推导了从表面位移反射的TEM(00)探测光束电场的附加相移，并利用菲涅耳衍射理论计算探测光束的传播。利用该理论，测量了三种玻璃的光学和热学性质，发现与文献值一致。在平顶激发下，开发了一种用于单次热镜或单次热透镜测量的实验装置。此外，该装置还用于热镜和热透镜的同时测量。通过同时测量可以测量更多的物理性质。
