PHOTOTHERMAL DIFFUSION

Pulsed photothermal deflection and diffraction effects: numerical modeling based on Fresnel diffraction theory

[+] Author Affiliations
Yue Han

Oakland University, Department of Physics, Rochester, Michigan?48309-4401

Z. L. Wu

Eastern Michigan University, Department of Physics and Astronomy, Experimental Laser Physics Laboratory, Ypsilanti, Michigan?48197

Joseph S. Rosenshein

Sinai Hospital of Detroit Medical Center, Center for Ophthalmic R&D, 6767 West Outer Drive, Detroit, Michigan?48235

and Oakland University, Department of Physics, Rochester, Michigan?48309-4401

Marshall Thomsen, Qiang Zhao, Kent Moncur

Eastern Michigan University, Department of Physics and Astronomy, Experimental Laser Physics Laboratory, Ypsilanti, Michigan?48197

Opt. Eng. 38(12), 2122-2128 (Dec 01, 1999). doi:10.1117/1.602321
History: Received Oct. 23, 1998; Revised Mar. 29, 1999; Accepted May 24, 1999
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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. © 1999 Society of Photo-Optical Instrumentation Engineers.

© 1999 Society of Photo-Optical Instrumentation Engineers

Citation

Yue Han ; Z. L. Wu ; Joseph S. Rosenshein ; Marshall Thomsen ; Qiang Zhao, et al.
"Pulsed photothermal deflection and diffraction effects: numerical modeling based on Fresnel diffraction theory", Opt. Eng. 38(12), 2122-2128 (Dec 01, 1999). ; http://dx.doi.org/10.1117/1.602321


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