Spectroscopy of supersmall absorption using the technique of a phase-contrast thermal lens

A. A. Babin; N. N. Belyaeva; E. L. Bubis; Felix I. Feldchtein; Gennady I. Freidman; S. V. Shubin; Ivan V. Yakovlev

doi:10.1117/12.166260

26 January 1994 Spectroscopy of supersmall absorption using the technique of a phase-contrast thermal lens

A. A. Babin, N. N. Belyaeva, E. L. Bubis, Felix I. Feldchtein, Gennady I. Freidman, S. V. Shubin, Ivan V. Yakovlev

Proceedings Volume 2205, 11th Symposium and School on High-Resolution Molecular Spectroscopy; (1994) https://doi.org/10.1117/12.166260
Event: High Resolution Molecular Spectroscopy: 11th Symposium and School, 1993, Moscow, Russian Federation

Abstract

The problem of measuring supersmall light absorption in materials led to the development of a high-sensitivity optothermal laser technique, thermal lens and interferometer technique being the most widely-known. An optimum combination of the two above methods has been implemented where high sensitivity of optothermal phase-contrast technique (which reached for liquid media 10^-9 cm^-1 at the pump energy 3 J) was demonstrated. The technique suggested here is quite competitive with other optothermal methods due to its simplicity of performing, absorption linearity of the measured signal and independence of the signal on absorption at the windows of the cell containing the medium under investigation.

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A. A. Babin, N. N. Belyaeva, E. L. Bubis, Felix I. Feldchtein, Gennady I. Freidman, S. V. Shubin, and Ivan V. Yakovlev "Spectroscopy of supersmall absorption using the technique of a phase-contrast thermal lens", Proc. SPIE 2205, 11th Symposium and School on High-Resolution Molecular Spectroscopy, (26 January 1994); https://doi.org/10.1117/12.166260

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