Measurement of the stationary thermal nonlinear refraction light wave-front distortions by image processing
作者:
A. Marcano O.,
R. Escalona,
期刊:
Review of Scientific Instruments
(AIP Available online 1997)
卷期:
Volume 68,
issue 4
页码: 1652-1656
ISSN:0034-6748
年代: 1997
DOI:10.1063/1.1147972
出版商: AIP
数据来源: AIP
摘要:
The thermal stationary nonlinear refraction is determined with enhanced sensitivity by measuring the profile distortions of a cw probe light beam in the presence of absorption of a collinearly propagating pump light beam. By measuring the total profile distortion of the probe beam for different position of the sample cell, a signal similar to the well-knownZ-scan signal is obtained. Using the Gaussian decomposition method a simple formula is deduced which relates the induced thermal phase shift to the magnitude of the observed signal. Phase shifts as low as &lgr;/40000 with a signal-to-noise ratio of unity becomes detectable with this technique. ©1997 American Institute of Physics.
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