Enhancement of second harmonic generation efficiency, laser damage threshold and optical properties of cobalt chloride doped with L-alanine single crystal

Abstract

In the present study, L-alanine crystal is grown with cobalt chloride as dopant by low temperature solution growth using slow evaporation technique at room temperature. The lattice parameters of the grown pure and cobalt chloride doped L-alanine crystals were determined by the single crystal X-ray diffraction technique. The presence of the elemental composition such as cobalt chloride present in the L-alanine lattice was confirmed by energy dispersive X-ray analysis. The optical transmittance, absorbance, reflectance was measured and used to study the optical properties of the pure and doped L-alanine crystal. The pure L-alanine crystal has high optical transmittance in the whole visible range and UV transparency with lower cutoff wavelength at 240[Formula: see text]nm. By adding cobalt chloride to L-alanine crystal, the transmittance decreases the value of cutoff shifts to the higher wavelengths. Nonlinear optical studies reveal that the SHG efficiency and laser damage threshold energy increases when the L-alanine crystal is doped with cobalt chloride. From microhardness studies, it is observed that the cobalt chloride doped L-alanine crystal is harder than the pure crystal.

Third order nonlinearity examined by pulsed and CW lasers: an organic urea barbituric acid (UBA) single crystal for optical limiting application with DFT study

“…The NLO crystal is heavily influenced by its surface quality which is more than that of optical (linear and nonlinear) properties, since it decides the ability of the crystal to resist against the damage even when the power intensities are high [41,42]. LDT study depends on several laser limitations such as beam location, beam size, pulse duration, energy, wavelength, transverse and longitudinal mode structures, the density of effects, thermal conductivity and diffusivity, quality of the crystal surface, optical absorption and specific heat (C p ) etc [43,44]. One crucial criterion for an NLO crystal to act as a device is its capability of withstanding to laser damage since high optical intensities are implicated in nonlinear (NL) processes [43].…”

“…LDT study depends on several laser limitations such as beam location, beam size, pulse duration, energy, wavelength, transverse and longitudinal mode structures, the density of effects, thermal conductivity and diffusivity, quality of the crystal surface, optical absorption and specific heat (C p ) etc [43,44]. One crucial criterion for an NLO crystal to act as a device is its capability of withstanding to laser damage since high optical intensities are implicated in nonlinear (NL) processes [43]. The LDT of NLO elements depends on chemical and physical imperfections in particularly on dislocation of crystal growth.…”

Enhancement of UV Second-Harmonic Radiation at Nonlinear Interfaces with Discontinuous Second-order Susceptibilities

“…Coherent light at ultraviolet (UV) and vacuum ultraviolet (VUV) delivered by all solid-state laser systems is highly demanded due to numerous practical applications in lithography 1 , photoelectron spectroscopy 2 – 4 , micro-machining and semiconductor processing 5 , high-density optical storage 6 , etc. Seeking for suitable transparent nonlinear media for UV and VUV harmonic wave generation has attracted great interest over past decades, such as optical crystals, high polymers and L-alanine crystal 7 . Currently, the most potential crystals to produce VUV coherent light by second-order nonlinear processes are KBe 2 BO 3 F 2 (KBBF) 8 – 12 and BaMgF 4 (BMF) 13 – 15 with cutoff wavelengths in the UV region of 153 nm and 126 nm, respectively.…”

Studies on growth and characterization of nicotinium tartrate single crystal: An efficient organic nonlinear optical material

“…The NLO materials, capable of efficient frequency conversion of infrared laser radiation into visible or ultraviolet wavelengths are of substantial interest for various applications such as high optical data storage, color displays, medical diagnostics, optical telecommunication, scintillator and piezoelectric. [2][3][4][5][6][7][8] Some of the tartaric acid-based complexes reported in the recent past are L-prolinium tartrate, 9 hydroxyethylammonium-L-tartrate monohydrate and D-tartrate, 10 L-tartaric acid-nicotinamide 11 and p-nitroaniline-L-tartaric acid. 12 Since L-tartaric acid has higher solubility in water, it could be crystallized into bigger sizes and in another way it reduces the production costs in comparison with all other amino acid materials.…”