ISSN:
1432-0649
Keywords:
42.65.-k
;
42.65.Jx
;
42.80.Bi
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract We study the application of spatial filtering to the far field detection of a probe beam with transverse phase modulation induced by the refractive index distribution generated in an optically thin film by the steady state absorption of a pump beam. To this end we introduce a mathematical model able to describe the phenomenon and we study the dependence of the detected signal on the radius and the position of a circular stop operating as a spatial filter. We show, by computer calculations, that spatial filtering allows enhancement of signal/background ratio as has already been shown for the case of pulsed “thermal lens” spectroscopy. We give an explicit expression of the detected signal as a function of sample properties that can be used for the interpretation of measurements.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00330095
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