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Proceedings Paper

Laser-induced coloration of magnesium-doped lithium niobate
Author(s): A. L. Aleksandrovsky; I. I. Naumova
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Paper Abstract

The nonlinear absorption in LiNbO3:Mg crystals exposed to pulsed green laser radiation was studied. A brown track in LiNbO3:Mg was observed at room temperature. A dose of green light about 2 J/cm2 was necessary to reach the maximum coloration, the corresponding absorption being proportional to the square of optical power density. This absorption adds to the two-photon absorption thus increasing the total nonlinear absorption approximately by a factor of eight. The coloration can be bleached by heating (the relaxation time constant being less than a second at 100 degree(s)C) and by exposure to the visible light with small peak power density. The nonlinear absorption limits the efficiency of second harmonic generation (SHG) at room temperature. A 40 to 50% efficiency rise accompanying the temperature increase was caused by the decay of coloration. The two-photon pumping of electron traps is a plausible trigger mechanism for laser-induced coloration.

Paper Details

Date Published: 11 December 1992
PDF: 8 pages
Proc. SPIE 1841, Nonlinear Optical Processes in Solids, (11 December 1992); doi: 10.1117/12.131837
Show Author Affiliations
A. L. Aleksandrovsky, Moscow State Univ. (Russia)
I. I. Naumova, Moscow State Univ. (Russia)


Published in SPIE Proceedings Vol. 1841:
Nonlinear Optical Processes in Solids

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