# Optical diffraction of second-harmonic signals in the $LiBO_{2}-Nb_{2}O_{5}$ glasses induced by self-organized $LiNbO_{3}$ crystallites

Venkataraman, Harihara B and Prasad, Syam N and Varma, KBR and Rodriguez, Vincent and Maglione, Mario and Vondermuhll, R and Etourneau, J (2005) Optical diffraction of second-harmonic signals in the $LiBO_{2}-Nb_{2}O_{5}$ glasses induced by self-organized $LiNbO_{3}$ crystallites. In: Applied Physics Letters, 87 (9).

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The nanocrystallites (approximate to 3 nm) of $LiNbO_{3}$, evolved in the $(100-x)LiBO_{2}-xNb_{2}O_{5}$ (5 \leq x \leq 20, in molar ratio) glass system exhibited intense second-harmonic signals in transmission mode when exposed to infrared (IR) light at \lambda=1064 nm. The second-harmonic waves were found to undergo optical diffraction which was attributed to the presence of self-organized sub micrometer-sized $LiNbO_{3}$ crystallites that were grown within the glass matrix along the parallel damage fringes created by the IR laser radiation. Micro-Raman studies carried out on the laser-irradiated samples confirmed the self-organized crystallites to be $LiNbO_{3}$.