Chemical Etching, AFM, Laser Damage Threshold, and Nonlinear Optical Studies of Potential Nonlinear Optical Crystal: Bis (L-Glutamine) Potassium Nitrate

A novel semiorganic nonlinear optical crystal bis (L-glutamine) potassium nitrate (BGPN) grown by slow evaporation technique at ambient temperature. The grown crystal surface has been analyzed by chemical etching and atomic force microscopy (AFM) studies. Amplitude parameters like area roughness, roughness average, valley height, valley depth, peak height, and peak valley height were measured successfully from AFM studies. Etching studies were carried out by various solvents like water, methanol and ethanol. The etching study indicates the occurrence of different types of etch pit patterns like striations and steplike pattern. The laser damage threshold energy has been measured by irradiating laser beam using a Q-switched Nd: YAG laser (1064 nm). Second harmonic generation (SHG) studies have been performed by famous Kurtz powder technique with reference to standard potassium dihydrogen phosphate single crystals (KDP). It is found from this technique that SHG efficiency of BGPN is in comparison to that of standard KDP crystals

Growth, HR-XRD, optical, thermal, luminescence and nonlinear optical studies of novel Organic nonlinear optical crystal: L-Threonine formate

The NLO single crystals of L-threonine formate (LTF) were grown by slow evaporation method in the molar ratio 1:1. The grown crystal was characterized by single crystal XRD, Powder XRD, HR-XRD, mass, thermal and UV-vis-NIR spectral analysis. Single crystal XRD analysis revealed that the crystal system belongs to tetragonal with cell parameters a = 7.86 angstrom, b = 7.86 angstrom and c = 11.07 angstrom. The sharp and well defined Bragg peaks observed in the powder XRD pattern confirm the crystalline nature of LTF compound. The structural perfection of the grown crystals has been analyzed by high-resolution X-ray diffraction (HR-XRD) analysis. Mass spectroscopic analysis determined the compound molecular weight from the full scan mass spectra. The optical properties of the grown crystal were calculated from UV transmission spectral analysis. Thermo gravimetric and differential thermal analysis reveals the thermal stability of the grown crystal. Second harmonic generation (SHG) of powdered LTF sample was tested using Nd:YAG laser and is found to be 1.21 times that of potassium dihydrogen orthophosphate. The fluorescence spectral study was carried out in the range of 280-500 nm and the optical band gap is estimated to be 3.042 e

Growth, spectral, optical, thermal, crystallization perfection and nonlinear optical studies of novel nonlinear optical crystal-Urea thiosemicarbazone monohydrate

Single crystals of organic nonlinear material urea thiosemicarbazone monohydrate (UTM) have been grown by slow evaporation method. The grown crystals were characterized by single crystal X-ray diffraction analysis reveals that sample crystallized in triclinic system with noncentrosymmetric space group P1. Powder XRD pattern confirmed that grown crystal posses highly crystalline nature. FTIR spectrum was recorded to identify the presence of functional groups and molecular structure was confirmed by H-1 NMR spectrum. Material confirmation of title compound has been performed by using mass spectroscopic analysis. Elemental composition of grown crystal was confirmed by energy-dispersive spectrometry (EDS). To study the crystalline perfection of the grown crystals, high-resolution X-ray diffraction (HR-XRD) study was carried out. Thermogravimetric and differential thermal analyses were employed to understand the thermal and physio-chemical stability of the synthesized compound. UV-Vis-NIR spectrum revealed the transmission properties of the crystal specimen. Relative SHG efficiency is measured by Kurtz and Perry method and found to about 0.89 times that of standard potassium dihydrogen phosphate (KDP) crystals

Growth, HR-XRD, optical, thermal, luminescence and nonlinear optical studies of novel organic nonlinear optical crystal: l-Threonine formate

The NLO single crystals of L-threonine formate (LTF) were grown by slow evaporation method in the molar ratio 1:1. The grown crystal was characterized by single crystal XRD, Powder XRD, HR-XRD, mass, thermal and UV-vis-NIR spectral analysis. Single crystal XRD analysis revealed that the crystal system belongs to tetragonal with cell parameters a = 7.86 angstrom, b = 7.86 angstrom and c = 11.07 angstrom. The sharp and well defined Bragg peaks observed in the powder XRD pattern confirm the crystalline nature of LTF compound. The structural perfection of the grown crystals has been analyzed by high-resolution X-ray diffraction (HR-XRD) analysis. Mass spectroscopic analysis determined the compound molecular weight from the full scan mass spectra. The optical properties of the grown crystal were calculated from UV transmission spectral analysis. Thermo gravimetric and differential thermal analysis reveals the thermal stability of the grown crystal. Second harmonic generation (SHG) of powdered LTF sample was tested using Nd:YAG laser and is found to be 1.21 times that of potassium dihydrogen orthophosphate. The fluorescence spectral study was carried out in the range of 280-500 nm and the optical band gap is estimated to be 3.042 e

An extensive investigation on nucleation, growth parameters, crystalline perfection, spectroscopy, thermal, optical, microhardness, dielectric and SHG studies on potential NLO crystal - Ammonium Hydrogen L-tartarte

Ammonium Hydrogen L-tartarte (AMT), an organic nonlinear optical crystal was grown by slow evaporation method at ambient temperature. Solubility, metastable zone width and induction period of Ammonium Hydrogen L-tartarte in aqueous solution were determined. Good quality crystals were selected and characterized by Single crystal XRD, HR-XRD, FT-IR, H-1 NMR, Mass, TGA-DTA, SEM, EDAX, optical and NLO studies. Single crystal XRD analysis revealed that the crystal system belongs to orthorhombic with cell parameters a = 7.65 angstrom, b = 7.85 angstrom and c = 11.07 angstrom. High-resolution-X-ray diffraction (HR-XRD) analysis was carried out to study the crystalline perfection of the grown crystal. H-1 NMR and FTIR spectrum thus confirmed the presence of functional groups of the grown crystal. Molecular mass of AMT was measured accurately by mass spectroscopic analysis. Surface features of the grown crystal were analyzed by SEM, AFM, chemical etching and the presence of elements in the compound was identified by EDAX analysis. Thermal behavior of the grown crystal has been studied by TG/DTA analysis. The recorded UV-Vis-NIR spectrum shows excellent transmission in the region of 190-1100 nm. The Vickers and Knoop's microhardness studies have been carried out on AMT crystals over a range of 10-50 g. Hardness anisotropy has been observed in accordance with the orientation of the crystal. Fluorescence spectral studies were carried in the range of 280-500 nm for the grown crystal. The SHG conversion efficiency and laser damage threshold were measured using an Nd: YAG laser (1064 nm)