Non-photorefractive LiNbO3:Mg as the effective material for the nonlinear optics

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Abstract
The comparative study of optical properties of Mg-doped and Mg-nondoped LiNbO3 and Fe-doped LiNbO3 crystals was carried out. In all the crystals doped with Mg ≥ 1 wt.% the value of photorefraction decreases not less than by 102 in spite of Fe incorporation up to 0.1 wt%. At room temperature the nonlinear optical elements of LiNbO3:2.4 wt% Mg reveal the conversion efficiency of SHG more than 25% with phase matching angle of 90[ddot]. X-ray and UV-induced changes of the optical absorption spectra reveal the alteration of the electron acceptor type in Mg-doped crystals. On the contrary to pure LiNbO3, in LiNbO3 doped by Mg the Fe3+-ion is not more the electron acceptor center, what is followed by the change of the photoelectric and consequently photorefractive properties. Mg incorporation affects the ESR spectrum of Fe3+ in LiNbO3 as well.

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