Due to this reason, it becomes important to grow a more and more new organic-based single crystal. Usually, organic materials show excellent nonlinear optical (NLO) characteristics. In the current technology world, there is a lot of competition for powerful nonlinear optical devices to satisfy the day-to-day requirements. In various device applications, nonlinear optical (NLO) crystals with high conversion efficiency for the second harmonic generation (SHG) and transparent in ultraviolet–visible regions are required. In the field of optoelectronics and photonics, nonlinear optical (NLO) materials are capable of generating the second harmonic frequency. The search for high non-linear optical crystals for efficient signal processing has been stimulated by optoelectronics. The growth of the new kind of optical crystals with good physical and chemical properties are very important in optoelectronics, photonics laser processing and other applications. Materials with high second-order optical nonlinearity, high optical transmittance with low cut-off wavelength, high laser damage threshold value and easy growth with large dimensions are needed to understand many of these applications. Optical applications depend upon various physical features, such as refractive index, birefringence, thermal stability and physicochemical behaviors. Nonlinear optical crystals are significant in science and modern technology because of their technological importance in the areas of optical communication, optical modulators, laser spectroscopy, frequency conversion, optical bi-stable devices, electro-optical device applications in photonics technology, optoelectronics, information processing, sensors, laser technology, frequency doubling and color displays. Over the last three decades, the discovery of new crystals for optical applications has been an emerging area of research.
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