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Optical Engineering

Pulsed photothermal deflection and diffraction effects: numerical modeling based on Fresnel diffraction theory
Author(s): Yue Han; Zhouling Wu; Joseph S. Rosenshein; Marshall Thomsen; Qiang Zhao; Kent Moncur
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Paper Abstract

We present a comprehensive theoretical model suitable for treating the effect of pulsed collinear photothermal deflection spectroscopy (PDS). The work is an extension of the theoretical model previously developed for the mirage effect, which can take into account both photothermal deflection and photothermal diffraction effects based on the Fresnel diffraction theory. With the diffraction model, both the collinear PDS and the photothermal lensing spectroscopy techniques can be treated in a unified manner. The model provides a detailed analysis of the laser-induced optical diffraction effect and can be used to optimize experimental parameters. The modeled results are presented in detail, with an emphasis on the advantages of using a near-field detection scheme for achieving the best sensitivity to local temperature change and better experimental stability against environmental noise.

Paper Details

Date Published: 1 December 1999
PDF: 7 pages
Opt. Eng. 38(12) doi: 10.1117/1.602321
Published in: Optical Engineering Volume 38, Issue 12
Show Author Affiliations
Yue Han, Eastern Michigan Univ. (United States)
Zhouling Wu, Eastern Michigan Univ. (United States)
Joseph S. Rosenshein, Sinai Hospital (United States)
Marshall Thomsen, Eastern Michigan Univ. (United States)
Qiang Zhao, Eastern Michigan Univ. (United States)
Kent Moncur, Eastern Michigan Univ. (United States)

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