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Optical Engineering

Intensity dependence of two-photon absorption in CdS measured by photoluminescence excited by femtosecond laser pulses
Author(s): Natalia M. Dushkina; Bruno Ullrich
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Paper Abstract

Two-photon absorption is evoked in a CdS crystal by laser excitation up to almost 200 GW/cm2 at 804 nm. Pulses with duration of 200 fs are used to achieve this high intensity. By means of a z-scan technique, the nonlinear absorption coefficient (?) is measured and the constant value of p= 6.9 cm/GW was found. Simultaneously, the two- photon excited emission is recorded. Examination of the photoluminescence data reveals that ? is not constant but decreases from 6.9 to 2.9 cm/GW with increasing excitation. The crossover between the ? values takes place at approximately 70% of the maximum intensity. The result shows that the two-photon excited photoluminescence is a very sensitive method to show saturation and intensity dependence of the nonlinear absorption coefficient.

Paper Details

Date Published: 1 September 2002
PDF: 4 pages
Opt. Eng. 41(9) doi: 10.1117/1.1497612
Published in: Optical Engineering Volume 41, Issue 9
Show Author Affiliations
Natalia M. Dushkina, Bowling Green State Univ. (United States)
Bruno Ullrich, Bowling Green State Univ. (United States)

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