Open AccessStudy on some linear and nonlinear optical parameters of glycine hydrofluoride single crystals
Author(s) -
A. Abu ElFadl,
Al-Saadawi Abdelsalam,
A. M. Nashaat
Publication year - 2018
Publication title -
materials science poland
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 32
eISSN - 2083-1331
pISSN - 2083-134X
DOI - 10.2478/msp-2018-0096
Subject(s) - materials science , refractive index , band gap , transmittance , dielectric , crystal (programming language) , optics , single crystal , dispersion (optics) , analytical chemistry (journal) , optical conductivity , second harmonic generation , molecular physics , optoelectronics , condensed matter physics , chemistry , crystallography , laser , physics , chromatography , computer science , programming language
Single crystal of glycine hydroflruoride (GHF) was grown from aqueous solution by slow evaporation technique. The structure of the grown crystal was tested and analyzed through X-ray powder diffraction. The functional groups have been identified from the FT-IR spectra. Slabs cut normal to the b-axis from the grown crystal were subjected to incident radiation with a wavelength range of 200 nm to 800 nm to investigate the transmittance and reflectance spectra. Linear optical parameters such as extinction coefficient k, refractive index n and both the real and imaginary parts: ∊ real and ∊ im of the dielectric permittivity were calculated as functions of the incident photon energy. The dispersion of the refractive index was fitted in terms of Cauchy formula and Wemple-DiDomenico single oscillator model. GHF crystals exhibited indirect optical interband transition and the optical energy gap E g was determined by using Tauc plot. The indirect band gaps at elevated temperatures were determined and their temperature dependence was estimated. Optical band gap E g values were found to decrease with an increase in crystal temperature; however, the band tail width exhibited opposite behavior. The nonlinear optical potential was examined by the second harmonic generation (SHG) test.