Laser-induced coloration of magnesium-doped lithium niobate

A. L. Aleksandrovsky; I. I. Naumova

doi:10.1117/12.131837

11 December 1992 Laser-induced coloration of magnesium-doped lithium niobate

A. L. Aleksandrovsky, I. I. Naumova

Proceedings Volume 1841, Nonlinear Optical Processes in Solids; (1992) https://doi.org/10.1117/12.131837
Event: XIV International Conference on Coherent and Nonlinear Optics, 1991, St. Petersburg, Russian Federation

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.

Citation Download Citation

A. L. Aleksandrovsky and I. I. Naumova "Laser-induced coloration of magnesium-doped lithium niobate", Proc. SPIE 1841, Nonlinear Optical Processes in Solids, (11 December 1992); https://doi.org/10.1117/12.131837

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