Semiorganic Nonlinear Optical Single Crystal Research Articles

SYNTHESIS, GROWTH, STRUCTURAL, SPECTROSCOPIC, OPTICAL, THERMAL AND MECHANICAL STUDIES OF A SEMI-ORGANIC NONLINEAR OPTICAL CRYSTAL: L-GLUTAMIC ACID HYDROCHLORIDE

The semi-organic nonlinear optical single crystal of L-glutamic acid hydrochloride was grown by slow evaporation solution growth technique at room temperature. The cell parameters of the grown crystal were estimated by single crystal X-ray diffraction analysis. The presence of various functional groups was identified from Fourier transform infrared analysis. The transmission spectrum of this crystal show that the lower cut-off wavelength lies at 248 nm. Thermal analysis was performed to study the thermal stability of the grown crystal. The Kurtz powder second harmonic generation test shows that the crystal is a potential candidate for optical second harmonic generation. Mechanical properties of the grown crystal were determined and Vickers' hardness number was calculated.

Crystal growth and characterization of a semiorganic nonlinear optical single crystal of gamma glycine

Gamma glycine has been successfully synthesized by taking glycine and potassium chloride and single crystals have been grown by solvent evaporation method for the first time. The grown single crystals have been analyzed with XRD, Fourier transform infrared (FTIR), and thermo gravimetric and differential thermal analyses (TG/DTA) measurements. Its mechanical behavior has been assessed by Vickers microhardness measurements. Its nonlinear optical property has been tested by Kurtz powder technique. Its optical behavior was examined by UV–vis., and found that the crystal is transparent in the region between 240 and 1200 nm. Hence, it may be very much useful for the second harmonic generation (SHG) applications.

Growth and characterization of a new semi-organic nonlinear optical sodium paranitrophenolate paranitrophenol dihydrate single crystal

A new semi-organic nonlinear optical sodium paranitrophenolate paranitrophenol dihydrate single crystal is grown successfully using methanol as solvent by slow evaporation technique to dimensions of 14 × 5 × 4 mm 3 in a period of 7 days. The grown crystal is characterized by X-ray diffractometry and UV–Visible spectral analysis. X-ray diffraction data reveals that the crystal belongs to monoclinic system with space group C2. Optical absorption studies illustrate low absorption in the entire UV and Visible region. The second harmonic generation (SHG) efficiency of the crystal measured by Kurtz's powder technique infers that the crystal has NLO coefficient 5 times greater than that of KDP crystal. Remarkable mechanical strength with the work hardening coefficient less than 2 and thermal stability up to 120 °C of the grown crystal is reported.

Investigation on the physicochemical properties of nonlinear optical (NLO) single crystal: l-histidinium dinitrate

A potentially useful semi-organic nonlinear optical single crystal of l-histidinium dinitrate (LHDN) has been synthesized and grown at room temperature by slow solvent evaporation method. The resulting crystals predominantly exhibit the needle morphology. The title compound has been subjected to single-crystal X-ray diffraction analysis to identify the unit cell parameters and morphology. The crystalline perfection of LHDN has been evaluated by high-resolution X-ray diffractometry (HRXRD). The transparency of the crystal was checked by UV–vis–NIR study. Thermal stability of LHDN investigated by TG/DTA and DSC analyses confirms that the compound is stable up to 165.5 °C. The second-harmonic generation efficiency was estimated by Kurtz and Perry powder technique and the study clearly suggests the influence of particle size on the SHG efficiency of LADN.

Growth, thermal and mechanical properties of new nonlinear optical barium bis-paranitrophenolate paranitrophenol tetrahydrate single crystal

Barium bis paranitrophenolate paranitrophenol tetrahydrate, a new semiorganic nonlinear optical single crystal has been grown by slow evaporation solution growth technique at room temperature of 30 °C. Crystal of dimensions of 29 mm × 11 mm × 5 mm was obtained in a period of 30 days. X-ray diffraction analysis reveal the newness of the crystal structure belonging to the orthorhombic class with lattice parameters a = 19.899(5) Å, b = 28.019(8) Å, c = 10.745(4) Å and α = β = γ = 90°. The grown crystal is examined for its nonlinear optical nature with Kurtz powder technique after being sieved for particle sizes between 5 and 100 μm and analyzed for its thermal and mechanical properties. The effective nonlinear optical coefficient being 16 times greater than that of KDP crystal, good thermal stability up to 120 °C with the Meyer's constant n < 2 helps fashion the crystal towards device geometry.

Growth of l-lysine monohydrochloride dihydrate bulk single crystal by Sankaranarayanan—Ramasamy (SR) method

Unidirectional bulk semi-organic nonlinear optical single crystal of l-lysine monohydrochloride dihydrate ( l-LMHCl) has been grown by Sankaranarayanan–Ramasamy (SR) method. The growth conditions have been optimized. The optical transparency of the grown crystal was measured.

Growth and characterization of semiorganic non-linear optical LHB single crystal

Single crystals of l-histidine bromide monohydrate (LHB), a semiorganic nonlinear (NLO) material have been successfully grown up to a size of 22mm×20mm×9mm. Morphology of the crystal was identified using CAD4-X-ray diffractometer. Thermal analysis of LHB crystal shows that the crystal starts its decomposition at 133.9°C. The microhardness studies of the crystal confirm anisotropy in the work hardening co-efficients for different orientations. Microstructural imperfections of the LHB crystal have been studied by etching. Photoconductivity studies of LHB reveals that it exhibits positive photoconductivity.