In recent years, nonlinear optical materials have received attention due to their potential applications in photonics and opto‐electronics. In this pursuit, lithium sodium sulfate (LSS) single crystals are synthesized by adopting a slow evaporation technique at constant temperature (40 °C). The single‐crystal X‐ray diffractometer (XRD) study confirms that the grown LSS belongs to trigonal symmetry with the lattice parameters a = b = 8.452 Å, and c = 30.27 Å. The crystalline nature and purity of LSS are confirmed by the powder XRD technique. The lower cutoff wavelength and optical bandgap of the grown crystal are determined using transmission spectra and found to be 335 nm and 3.5 eV, respectively. The photoluminescence spectrum of the crystal shows the strong blue/green emission at 510 nm, which explains the second harmonic generation (SHG) property. The SHG efficiency is confirmed by the Kurtz and Perry powder method and the SHG efficiency of LSS is 1.09 times greater than that of pottasium dihydrogen phosphate (KDP). Thermal parameters of the titled material are calculated using a thermogravimetric (TG)/differential thermal analysis (DTA) analyzer. Microhardness studies and the diamagnetic nature of LSS are carried out using a Vicker's hardness tester and a vibration sample magnetometer.

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Semiorganic nonlinear optical single crystals of Bisthiourea potassium sulphato Oxalate (BTKSO) are successfully grown by slow solvent evaporation technique at ambient temperature. The structural property of grown BTKSO crystal was determined by single crystal X-Ray diffractometer. It reveals the triclinic structure with the space group of P1, and the lattice parameters are a = 9.4 ± 0.5Ǻ, b = 10.1 ± 0.5Ǻ, c = 15.7 ± 0.8Ǻ, V = 1400 ± 200Ǻ 3 . Fourier transform infrared (FTIR) studies substantiate the functional groups of the present crystal and the presence of elements was confirmed by employing energy dispersive spectroscopic technique. The optical behavior and transparency nature of BTKSO crystal were studied by UV-Vis-NIR spectra. The Kurtz powder technique is used to ascertain the nonlinear optical behavior of the grown crystal. Its second harmonic conversion efficiency (SHG) is found to be 1.31 times higher than that of reference potassium dihydrogen phosphate (KDP) material. The photoluminescence spectrum of the title crystal shows the strong green emission at 573 nm. The thermal and mechanical behaviors of the grown crystal were studied by thermo gravimetric and differential thermal analyzer (TG/DTA) and Vicker"s hardness test respectively.

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Single crystals of strontium chloride added with Nicotinic acid were grown from aqueous solution by slow evaporation technique. The grown crystals are characterized by using single crystal XRD, FTIR spectroscopy, optical transmission, mechanical and photoluminescence spectral studies. As a result Single crystal XRD studies exposed that the crystal belongs to tetragonal system. The FTIR studies help to identify the functional groups which are present in the crystals. The optical transmission analysis shows that the crystal is transparent in the entire visible region. The cut off wavelength is 275nm. The sample is also subjected to photoluminescence analysis. Hardness was measured by the Vickers's hardness tester. The diamagnetic behavior of the grown crystal is confirmed by vibrating sample magnetometer.