The nanocrystallites of , evolved in the (, in molar ratio) glass system exhibited intense second-harmonic signals in transmission mode when exposed to infrared (IR) light at . The second-harmonic waves were found to undergo optical diffraction which was attributed to the presence of self-organized submicrometer-sized 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 .
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