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Thermoelastic response of pulsed photothermal deformation of thin plates

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3 Author(s)
Cheng, Jian-Chun ; Institute of Acoustics and Laboratory of Modern Acoustics, Nanjing University, Nanjing 210093, People’s Republic of China ; Wu, Lei ; Shu-yi Zhang

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A theoretical investigation of the dynamic thermoelastic response of pulsed photothermal deformation (PTD) deflection detections for some Q‐switch laser pulses and finite thickness samples has been presented. The results show that signals can be characterized by a quasistatic process when the laser pulse rise time is on the order of 1 μs and the sample thickness is in submillimeter range (typically for semiconductor wafers). However, as the pulse rise time decreases or the sample thickness increases, the dynamic wave behavior gradually becomes apparent, and the quasistatic approximation gives only a contour curve of the dynamic time evolution. When the rise time decreases on the order of 10 ns or less for the same kind of the samples, the PTD deflection signal reflects a totally dynamic wave behavior.

Published in:

Journal of Applied Physics  (Volume:76 ,  Issue: 2 )

Date of Publication:

Jul 1994

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