A phase matchable nonlinear optical crystal salicylideneaniline: Synthesis, growth and characterization

A new NLO organic crystal of salicylideneaniline (SAN) was synthesized and SAN bulk crystal was grown along <412> plane using uniaxial crystal growth method of Sankaranarayanan–Ramasamy with a new modification in the growth assembly. The crystal was grown with a growth rate of 2 mm/day upto a dimension of 4 cm in length and 6 cm in diameter having a cylindrical morphology within 30 days. The powder XRD analysis confirmed the crystalline perfection. The presence of CN bond with intramolecular hydrogen bonding on the protonation of ions were confirmed by FTIR analysis. The range of optical absorbance was ascertained by recording UV–vis–NIR spectrum. The 1H1 and C13 NMR spectrum confirms the molecular structure. Dielectric studies were carried out to estimate the dielectric parameters of the grown crystal in the frequency range from 100 Hz to 100 KHz. The existence of second harmonic generation (SHG) signal was observed using Nd:YAG laser with the fundamental wavelength of 1064 nm. Phase matching parameters of the grown crystal confirms that salicylideneaniline is a promising candidate for LASER applications.