Dynamics of refractive-index changes in a Nd:YAG laser crystal under excitation of Nd3+ ions
JOSA B, Vol. 16, Issue 7, pp. 1072-1079 (1999)
http://dx.doi.org/10.1364/JOSAB.16.001072
Acrobat PDF (151 KB)
Abstract
The mechanism for refractive-index changes that accompany changes in population during pumping and amplification of an optical beam is studied in a Nd:YAG laser crystal by both resonant four-wave mixing and interferometric techniques. It is found that these refractive-index changes (connected with the difference in polarizability of excited and unexcited Nd3+ ions) have two components: a small noninertial component that accompanies an amplified optical pulse and the major changes that are intensified with a delay time of ∼3 μs. The latter effect is explained by population (or depopulation) of a higher-lying energy level 2(F2)5/2 of the 4f electron shell of Nd3+ ions, which has large polarizability in near-IR and visible light. The real part of the nonlinear optical resonant susceptibility of the inverted Nd:YAG caused by the refractive-index changes is also discussed.
© 1999 Optical Society of America
[Optical Society of America ]
OCIS Codes
(140.3280) Lasers and laser optics : Laser amplifiers
(140.3530) Lasers and laser optics : Lasers, neodymium
(160.3380) Materials : Laser materials
(160.5690) Materials : Rare-earth-doped materials
(190.4720) Nonlinear optics : Optical nonlinearities of condensed matter
Citation
O. L. Antipov, A. S. Kuzhelev, D. V. Chausov, and A. P. Zinov’ev, "Dynamics of refractive-index changes in a Nd:YAG laser crystal under excitation of Nd3+ ions," J. Opt. Soc. Am. B 16, 1072-1079 (1999)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-16-7-1072
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