## Probe-Beam Diffraction in a Pulsed Top-Hat Beam Thermal Lens with a Mode-Mismatched Configuration

Applied Optics, Vol. 38, Issue 24, pp. 5241-5249 (1999)

http://dx.doi.org/10.1364/AO.38.005241

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### Abstract

The Fresnel diffraction integral is used directly to describe the thermal lens (TL) effect with a mode-mismatched collinear configuration. The TL amplitudes obtained with Gaussian, Airy, and top-hat beam excitations are computed and compared. Numerical results for beam geometries optimized for both near- and far-field detection schemes are presented, and the analytical results developed by Bialkowski and Chartier [Appl. Opt. **36,** 6711 (1997)] for a Gaussian beam TL effect are summarized in simplified form. Both the numerical and the analytical results demonstrate that, under a beam geometry optimized for either near- or far-field detection, the Gaussian beam TL experiment has approximately the same maximum signal amplitude as does the photothermal-interference scheme. A comparison between the optimum near- and far-field detection beam geometries indicates that a practical mode-mismatched TL instrument should be based on the far-field detection geometry. The computation results further demonstrate that the optimum beam geometry and the TL amplitude depend largely on the excitation-beam profile. The top-hat beam TL experiment is approximately twice as sensitive as the Gaussian beam TL scheme.

© 1999 Optical Society of America

**OCIS Codes**

(050.1940) Diffraction and gratings : Diffraction

(120.6810) Instrumentation, measurement, and metrology : Thermal effects

(300.1030) Spectroscopy : Absorption

(300.6430) Spectroscopy : Spectroscopy, photothermal

**Citation**

Bincheng Li and Eberhard Welsch, "Probe-Beam Diffraction in a Pulsed Top-Hat Beam Thermal Lens with a Mode-Mismatched Configuration," Appl. Opt. **38**, 5241-5249 (1999)

http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-24-5241

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