Interferometric detection of photothermal effects in uranyl optical glass

Alexandru M. Preda; Constantin P. Cristescu; Ion M. Popescu; Liliana Preda; Eugen Nicolae Scarlat

doi:10.1117/12.432806

29 June 2001 Interferometric detection of photothermal effects in uranyl optical glass

Alexandru M. Preda, Constantin P. Cristescu, Ion M. Popescu, Liliana Preda, Eugen Nicolae Scarlat

Proceedings Volume 4430, ROMOPTO 2000: Sixth Conference on Optics; (2001) https://doi.org/10.1117/12.432806
Event: ROMOPTO 2000: Sixth Conference on Optics, 2000, Bucharest, Romania

Abstract

In this paper we present a sensitive photothermal interferometric detection technique using a Wollaston prism. The interference fringe pattern is formed by overlapping of the ordinary and extraordinary beams with adjustable intensities by a linear polarizer. The interferometric montage is made both for the pump beam (Ar-ion laser) and the probe beam (He-Ne laser). From the analysis of the interference patterns obtained separately for the two beams, we calculate the absolute change of the refractive index in the middle of the heated zone of an uranyl-doped optical glass, as well as the average transverse refractive index gradient induced by the pump laser. The experimental results are interpreted in terms of a Gaussian beam propagating through a weak absorptive medium whose refractive index is thermally modified by the pump beam.

Citation Download Citation

Alexandru M. Preda, Constantin P. Cristescu, Ion M. Popescu, Liliana Preda, and Eugen Nicolae Scarlat "Interferometric detection of photothermal effects in uranyl optical glass", Proc. SPIE 4430, ROMOPTO 2000: Sixth Conference on Optics, (29 June 2001); https://doi.org/10.1117/12.432806

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KEYWORDS

Refractive index

Laser beam diagnostics

Prisms

Glasses

Interferometry

Interferometers

Absorption

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