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The slow evaporation technique was adopted for the growth of L-tyrosine doped Thiourea (Bis) Cadmium Acetate (CTA) single crystal. The doped crystals were characterized by powder X-ray diffraction, FT-IR analysis, SHG Studies, UV-vis and Vickers microhardness studies. The UV-visible absorption spectrum is found to have improved optical parameters than pure CTA. The optical study revealed that the doped CTA crystal has high transmission with low cut off wavelength of 290 nm. The optical band gap was found to be 4.14 eV. The Second harmonic generation efficiency measured using Nd-YAG laser is 3.64 times higher than pure CTA. [ABSTRACT FROM AUTHOR]

Mentioned communication explores the modification in properties of Zinc Thiourea Sulphate (ZTS) crystal due to L-Threonine (LT) addition. Superior quality LT-doped ZTS crystal with 0.5 M% concentration of LT was grown by the slow evaporation solution growth technique. Powder X-ray diffraction technique was applied to study the cell parameters which confirmed orthorhombic crystal structure of both pure and LT-ZTS crystal with slight variation in cell parameters. Shimatzu make spectrophotometer confirmed the UV-Visible spectral analysis in the range of 200–900 nm which affirmed the 94% transmittance, enhanced bandgap value (4.72 eV), lower cut-off value (246 nm) and lower optical constants viz. extinction coefficient, polarizability, refractive index, and reflectance of LT-ZTS crystal. The higher second harmonic generation (SHG) efficiency of LT-doped ZTS was pointed by Kurtz Perry powder method (3.06 times of pure ZTS crystal and 3.62 times of KDP crystal) using Nd: YAG laser. The colour centered emission and electronic purity of parent and doped ZTS crystals were examined which resulted in the violet emission in visible region for both pure and LT-ZTS crystals. Z-scan technique is used to identify the Kerr lensing nonlinearity in pure and LT-doped ZTS crystal. Close aperture Z-scan curve demonstrated negative refraction nonlinearity (self-defocusing nature) for pure and positive refraction nonlinearity (self-focusing nature) for LT-ZTS crystal. Calculated value of refraction nonlinearity n2 is −2.2 × 10 − 1 1  cm2/W for pure ZTS and + 4.99 × 10 − 1 2  cm2/W for LT-ZTS crystal. Open aperture Z-scan showed reverse saturable absorption effect (RSA) in pure ZTS and saturable absorption effect (SA) in LT-ZTS crystal. The β value is 2.85 × 10 − 5  cm/W for pure ZTS and 3.92 × 10 − 5  cm/W for LT-ZTS crystal. The χ 3 of ZTS crystal is 6.133 × 10 − 5  cm/W and 1.655 × 10 − 4  cm2/W for LT-ZTS crystal. The transition in TONLO parameters is observed due to doping of LT in ZTS. The obtained parameters indicated the superiority of LT-ZTS for application in distinct laser stabilization systems, UV shelter and NLO applications. [ABSTRACT FROM AUTHOR]

The non-linear optical single crystal of thiourea ammonium acetate doped potassium dihydrogen phosphate was grown by slow evaporation solution technique of size 19 × 11 × 4 mm3. The crystallographic unit cell parameters of grown crystal were determined by single crystal X-ray diffraction study. The optical study revealed that the doped KDP crystal has high transmittance, low cut off wavelength and high optical band gap. The enhanced second harmonic generation efficiency of doped KDP crystal was determined by employing Kurtz-Perry powder technique. The third order non-linear absorption coefficient (β), non-linear refractive index (n2) and susceptibility [χ(3)] were calculated using Z-scan technique. The laser damage threshold of grown crystal has been determined. The thermal properties of the grown crystal were carried out by thermogravimetric and differential thermal analysis. [ABSTRACT FROM AUTHOR]

We aimed to investigate the influence potassium tetra thiourea chloride (PTTC) on optical, dielectric and thermal properties of potassium dihydrogen phosphate (KDP) crystals. It was found that by addition of PTTC SHG efficiency has been enhanced. In addition, third order nonlinear properties have been studied by open and close aperture Z-scan technique. The enhanced LDT of grown crystal is found to be 2.08 GW/cm2. The dielectric response of grown crystal results lowers magnitudes. Thermal stability of grown crystal has been studied by TGA, DTA and DSC. The mechanical strength of doped crystals has been investigated by the Vickers microhardness studies and results are discussed. [ABSTRACT FROM PUBLISHER]

Optically transparent 11 × 10 × 4 mm3bis-thiourea zinc chloride (BTZC) doped potassium dihydrogen phosphate (KDP) crystal has been grown by slow evaporation solution technique. The cell parameters of the grown crystal have been determined by single crystal X-ray diffraction analysis. The incorporation of BTZC in KDP crystal has been qualitatively analysed by FT-IR spectral analysis. The optical transparency and vital optical constants of BTZC doped KDP single crystals have been evaluated in the range of 200–900 nm. The mechanical behaviour of pure and doped KDP crystals has been investigated under the Vickers microhardness studies. The dielectric parameters of grown crystal have been investigated within the frequency range of 10–100 KHz. In Kurtz–Perry powder test, the second harmonic generation (SHG) efficiency of BTZC doped KDP crystal is found to be 1.65 times that of KDP material. [ABSTRACT FROM AUTHOR]

In the present study, pure and -cystine (LC) doped zinc thiourea sulphate (ZTS) crystals have been grown by slow evaporation solution technique at ambient temperature. The powder X-ray diffraction (XRD) analysis has been carried out to identify the shifts in peak positions and structural parameters of grown crystals. The incorporation of LC in ZTS crystal has been qualitatively analyzed by means of Fourier transform infrared (FTIR) spectroscopic study. In UV-visible studies, the influence of LC on optical transparency, bandgap and various optical constants of ZTS crystal have been investigated to explore various optical applications. The thermal stability of LC doped ZTS crystal has been determined by means of differential scanning calorimetry (DSC) analysis. The hardness behavior and hardness number of grown crystals have been comparatively evaluated by employing the Vicker's microhardness test. The dielectric study of pure and LC doped ZTS crystal has been carried out at different temperature. In Kurtz-Perry powder technique, the second harmonic generation (SHG) efficiency of LC doped ZTS crystal is found to be 1.16 times that of ZTS crystal. [ABSTRACT FROM AUTHOR]

In this study, pure andl-valine (LV)-doped bis-thiourea cadmium acetate (BTCA) crystals have been grown by slow solution evaporation technique. For the first time, LV has been used as a dopant to tune the optical (linear and third-order non-linear optical) and electrical properties of BTCA crystal which are vital for various integrated optic device applications. The UV-visible spectral analysis has been performed in the range of 200–900 nm to determine the optical transparency of grown crystals. The Z-scan (open and closed apertures) studies were undertaken at 632.8 nm to ascertain the nature of third-order non-linearity in grown crystals. The third-order non-linear optical parameters such as non-linear refraction (n2), absorption coefficient (β) and susceptibility (χ3) of grown crystals have been calculated. The susceptibility (χ3) of pure and LV-doped BTCA crystal is found to be 2.58 × 10−4esu and 3.34 × 10−4 esu, respectively. The electrical studies have been carried out to analyse the dielectric constant, dielectric loss, ac resistivity and ac conductivity of pure and LV-doped BTCA crystals. [ABSTRACT FROM AUTHOR]

In present studies, l-arginine doped zinc thiourea chloride (LAZTC) crystal has been grown by slow solution evaporation technique. The cell parameters of LAZTC crystal were determined using the single crystal X-ray diffraction technique. The incorporation of l-arginine in ZTC has been confirmed by means of Fourier transform infrared analysis. The high optical transparency of the grown crystal has been examined under the UV-visible study. The wide optical band gap of LAZTC crystal is found to be 5·25 eV. The photoluminescence study of grown crystal has been investigated in the range of 300 to 700 nm. The negative photoconducting nature of LAZTC crystal has been investigated by means of photoconductivity studies. Thermal stability of LAZTC crystal was evaluated by thermogravimetric and differential thermal analysis. The dielectric measurements confirmed the lower dielectric characteristics of LAZTC crystal. [ABSTRACT FROM AUTHOR]