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Absorbance Measurements in Optically Inhomogeneous Samples Using Phase-Conjugate Thermal Lens Spectroscopy

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Abstract:

The optical phase conjugation properties of a BaTiO3 crystal are employed in a thermal lens experiment to measure small absorbance values of optically inhomogeneous samples. The sensitivity of the thermal lens, together with the beam reconstruction capabilities of phase conjugation, allows measurement of absorbances as low as 1.2 × 10−5 in the presence of large-amplitude spatial noise. A model which describes the behavior of an ordinary thermal lens could be used to evaluate the behavior of the phase-conjugate thermal lens response. Controlled phase-front perturbations generated by the thermal lens are used to characterize the influence of optical path distortions on phase-conjugate reflectivity.

Keywords: Photothermal spectroscopy; Scattering samples; Thermal lens

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702924123827

Affiliations: 1: Department of Chemistry, University of Utah, Salt Lake City, Utah 84112; present address: Center for X-Ray Lithography, 3371 Schneider Dr., Stoughton, WI 53589 2: Department of Chemistry, University of Utah, Salt Lake City, Utah 84112

Publication date: September 1, 1992

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