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Proceedings Paper

Application of dynamic two-wave mixing for detection of thermal gratings in liquids with low-optical absorption
Author(s): Sandra E. Balderas Mata; Ponciano Rodriguez Montero; Serguei Stepanov
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Paper Abstract

Photo-thermal effect is in general a well-established technique for remote and nondestructive material and structure evaluation. In particular, the method of transient thermal gratings is typically used for characterization of thermal properties and of low optical absorption in liquids. Conventional experimental configuration implies utilizing two mutually coherent recording beams to produce the thermal grating and one additional probe beam to detect it. We propose to perform recording and simultaneously probing the thermal grating using the same recording beams in configuration of dynamic two-wave-mixing (TWM), which simplifies the detection configuration and, as we hope, increases the sensitivity. In this configuration the sample is irradiated by the interference pattern of two coherent beams, in one of which the periodic phase modulation is additionally introduced. The output signal is detected as an amplitude modulation in one of the transmitted beams using conventional high-sensitivity lock-in amplification technique. The detected output signal is proportional to the amplitude of the thermal grating (but not to the grating diffraction efficiency as in coventional arrangement with additional probe beam), which also potentially increases the sensitivity. While the grating amplitude is evaluated directly from the output signal amplitude detected in this configuration, the photo-thermal grating formation time is obtained from position of the so-called "cut-off" frequency in the signal modulation frequency dependence. Details of experiments with this configuration using slightly dyed acetone sample at the wavelength 633 nm, which resulted in evaluation of the characteristic grating recording time and, finally, of the thermal diffusivity coefficient of the liquid, are presented.

Paper Details

Date Published: 10 November 2003
PDF: 6 pages
Proc. SPIE 5191, Optical Diagnostics for Fluids, Solids, and Combustion II, (10 November 2003); doi: 10.1117/12.505245
Show Author Affiliations
Sandra E. Balderas Mata, Instituto Nacional de Astrofisica, Optica y Electronica (Mexico)
Ponciano Rodriguez Montero, Instituto Nacional de Astrofisica, Optica y Electronica (Mexico)
Serguei Stepanov, Instituto Nacional de Astrofisica, Optica y Electronica (Mexico)

Published in SPIE Proceedings Vol. 5191:
Optical Diagnostics for Fluids, Solids, and Combustion II
Patrick V. Farrell; Fu-Pen Chiang; Carolyn R. Mercer; Gongxin Shen, Editor(s)

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