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Optics Letters

Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 33, Iss. 13 — Jul. 1, 2008
  • pp: 1464–1466

Top-hat cw-laser-induced time-resolved mode-mismatched thermal lens spectroscopy for quantitative analysis of low-absorption materials

Nelson G.C. Astrath, Francine B.G. Astrath, Jun Shen, Jianqin Zhou, Paulo R.B. Pedreira, Luis C. Malacarne, Antonio C. Bento, and Mauro L. Baesso  »View Author Affiliations


Optics Letters, Vol. 33, Issue 13, pp. 1464-1466 (2008)
http://dx.doi.org/10.1364/OL.33.001464


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Abstract

Thermal lens spectroscopy is a highly sensitive and versatile photothermal technique for material analysis, providing optical and thermal properties. To use less expensive multimode non-Gaussian lasers for quantitative analysis of low-absorption materials, this Letter presents a theoretical model for time-resolved mode-mismatched thermal lens spectroscopy induced by a cw laser with a top-hat profile. The temperature profile in a sample was calculated, and the intensity of the probe beam center at the detector plane was also derived using the Fresnel diffraction theory. Experimental validation was performed with glass samples, and the results were found well consistent with literature values of the thermo-optical properties of the samples.

© 2008 Optical Society of America

OCIS Codes
(120.6810) Instrumentation, measurement, and metrology : Thermal effects
(300.6430) Spectroscopy : Spectroscopy, photothermal
(350.5340) Other areas of optics : Photothermal effects
(350.6830) Other areas of optics : Thermal lensing

ToC Category:
Spectroscopy

History
Original Manuscript: April 15, 2008
Manuscript Accepted: May 17, 2008
Published: June 24, 2008

Citation
Nelson G. C. Astrath, Francine B. G. Astrath, Jun Shen, Jianqin Zhou, Paulo R. B. Pedreira, Luis C. Malacarne, Antonio C. Bento, and Mauro L. Baesso, "Top-hat cw-laser-induced time-resolved mode-mismatched thermal lens spectroscopy for quantitative analysis of low-absorption materials," Opt. Lett. 33, 1464-1466 (2008)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-33-13-1464

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