Third order nonlinear optical, spectral, luminescence, mechanical strength and electrical properties of d – Alanine bulk crystals

Abstract Optical quality d - Alanine bulk crystals were grown by slow evaporation technique. The grown crystal is confirmed by single crystal XRD. The functional parameters are analysed by the FTIR and powder XRD implicates its crystalline nature. The optical constants of the as-grown crystal were determined from the uv visible spectral studies. The third order nonlinear refractive index and nonlinear absorption coefficient of the grown crystal were measured by Z-scan studies. The third order nonlinear susceptibility was found to be 2.2545 х 10−6 esu which seems to be fairly high. The Photoluminescence spectra reveal the emission bands for d -Alanine crystals. The hardness testing was accomplished by Vickers and Knoop testing to determine the Young's Modulus of the crystal. The d.c. conductivity of the grown crystal was measured by the complex impedance analysis wherein the obtained plot in the form of semicircle finds application in Debye relaxation for materials having large dc conductivity.