Studies on the thermal, optical and dielectric properties of a new nonlinear optical crystal — L-citrulline oxalate grown by slow evaporation technique

Abstract

In this paper we report the thermal, optical and dielectric properties of L-citrulline oxalate (LCO) monohydrate-a new nonlinear optical (NLO) organic crystal grown from aqueous solution by slow evaporation technique. It has good thermal stability up to 165 o C. Optical transmittance of LCO is measured in the range 200-1000 nm and the crystal possesses a wide transparency region from 311nm to the far IR region. It has a band gap of 3.86eV. Hence the material is suitable for application as windows in spectral instruments in this region. The dielectric properties of the crystal have also been investigated. The dielectric constant obtained for LCO is higher at lower frequencies and then it decreases with increasing frequencies and saturates for further increase in the frequency. The second harmonic efficiency is found to be only 0.4 times that of KDP which can be improved by doping with alkali metals like lithium.

Effect of Lithium Doping on the Properties L-Citrulline Oxalate Monohydrate Nonlinear Optical Crystals

“…L-citrulline oxalate has already been identified as a promising organic nonlinear optical material [12,13]. The present work reveals the influence of lithium doping on the growth and properties of LCO single crystals.…”

“…Aqueous solutions of L-citrulline and oxalic acid were mixed in equimolar ratio to get L-citrulline oxalate (LCO) as mentioned in an earlier report [12,13]. For growing the doped crystals, 2 mol% of lithium sulphate was added to the LCO solution.…”

“…Lithium based materials find applications in the fields of solid state rechargeable batteries, optical and acoustic devices and as photorefractive materials. In the present work, a new organic crystal, L-citrulline oxalate [LCO], showing moderate nonlinearity [12,13], has been grown by the simple slow evaporation technique. Doping the crystal with lithium enhances the nonlinear optical properties and improves the optical and thermal properties.…”

Crystal growth and impact a Bisthiourea on structural, optical, thermal and mechanical behavior of Potassium sulphato oxalate a novel semi organic nonlinear optical material

“…Those materials in addition to retaining excessive optical nonlinearities of organic molecules also possess appropriate physical properties. A delivered benefit is that large single crystals may be grown from slow evaporation solution growth technique [3,4]. Thiourea is one of the less notably delocalized organic and coplanar in structure, it exhibits mesomeric effects which might be answerable for a second harmonic generation (SHG) within the blue-near-UV region and act as a good ligand.…”