Thecurrent advances in science and technology have brought a great demand ofvarious crystals with abundant applications. A field of multidisciplinarynature in science has been emerged, known as crystal growth, which deals withthe crystal growth methods, crystals characterizations and crystal growththeories. There are different types of crystals having various applicationsgrown by different techniques.

Onesuch interesting crystal is non linear optical crystal which can be used in wide range of opticalapplications including laser harmonic generations (SFG), frequency conversion(DFG), optical parametric generation (OPG), optical parametric amplification(OPA) and electro-optical modulation. After the discovery of the NLO effect scientist immediately predictedthat any practical applications of NLO would depend on the development of newcrystals. Today some scientist are even inclined to think ofNLO crystals as the feature optical semiconductor and research for newmaterials are still very active.

The demand for nonlinear optical crystals withsuperior properties is increasing due to sudden large increase in the design ofnonlinear optical devices with higher performance. The NLO crystals can be classified into Inorganic, Organic andSemi organic categories. Organic materials are known for their low cost, fastand large nonlinear response over a broad frequency range, inherent syntheticflexibility and high optical damage threshold. Generally,there are three main categories of crystal growth processes, S – S (processinvolving solid – solid phase transitions), L – S (process involving liquid –solid phase transitions) and V – S (process involving vapor – solid phasetransitions). Our work is based on organic and inorganiccrystals by solution growth technique at room temperature.

In solution growth,the chemical components that form the crystal are dissolved in a liquid mediumor flux, and allowed to crystallize slowly as the temperature drops. Accordingto the solubility of the crystal material, different solution growth techniquesare employed. When large volumes of single crystal materials are needed forcertain applications, solution growth methods may offer an advantage of easierscaling-up processes.  The synthesis anddeep study of such NLO crystals and reporting the findings would be highlyvaluable to the optical applications.Ourinterest is to synthesis some organic and inorganic NLO crystals for XRD, FTIR (Fourier transforminfrared spectroscopy) analysis to confirm the functional group present in thecrystal.

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Secondly Ultra violet (uv) – visible (vis) -near infrared (NIR)study is used for optical (reflectance, transmittance and absorbance)measurements in the wavelength range (175-3300 nm).SubsequentlyIR, Raman Infrared and Raman spectroscopy involve the study of the interactionof radiation with molecular vibrations, DifferentialThermal Analysis (DTA which measures the relative expansion/ contractionbetween a sample and the standard with varying temperature). Thermo gravimetricanalysis (TGA), measures the change in mass of the sample with varyingtemperature, Differential scanning Calorimeter (DSC) measures the energychanges in the sample with varying temperature by measuring the heat flow inthe form of temperature difference between the reference and the sample. Further, Micro hardness test which is used to determine thehardness of a material to deformation.

Finally, the most common and importanttest in NLO phenomenon is the second-harmonic-generation (SHG) to prove the second harmonic efficiency.