Abstract
Single crystals of l-alanine of dimensions 2×1.1×0.5cm3 were grown by evaporation method using deionised water as a solvent. The morphology of the grown crystals had (120) and (011) as their prominent faces. UV–vis-near IR spectrum shows the transparency range of l-alanine crystal available for frequency doubling from 250 to 1400nm. Phase-matched second harmonic generation was observed in l-alanine sample by using 7ns Q-switched Nd:YAG laser with OPO set up. In the present work, phase matching was achieved by angle and wavelength tuning. The angular and spectral phase-matching bandwidths were determined experimentally for a 1.5mm thick l-alanine crystal and the results have been compared with their theoretical results. Further the possible reasons for the broadening of SHG spectrum have been discussed.
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