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T. Sivanesan ¹, V. Natarajan ², S. Pandi ³

Affiliations
1 Dept. of Physics, Aksheya Engineering College, Puludivakkam- 603 314, Kanchipuram Dt. Tamil Nadu, IN
2 Rajalakshmi Institute of Technology, Kunthampakkam-602 107, Kanchipuram Dt., Tamil Nadu, IN
3 Dept. of Physics, Presidency College, Chennai- 600 005, IN

Abstract

Single crystals of α-Glycine up to the size of 4 × 4 × 1 mm³ were grown for optical characterization by the solution growth method using methanol as a solvent. The crystal structure was studied by X-ray diffraction. The UV-visual absorption spectra indicate a good transparency between 200 and 1400 nm. The non-linear refractive index n₂ and susceptibility χ ⁽³⁾ have been measured through the Z-scan technique. α-Glycine exhibits saturation absorption and self-focusing performance. Non-linear absorption co-efficient β is determined as 2.4763 x 10 ^-5 cm/W. Non-linear refractive index n₂ measured at the wavelength of 632.8 nm is calculated as 2.14435 x 10^-8 cm²/W. The real and imaginary pars of χ ⁽³⁾ have been measured at 632.8 nm and found to be 7.9732 x 10^-07 esu and 8.0018 x 10^-07 esu, respectively. The measured 3rd order non-linear properties confirm its suitability for non-linear optical devices such as optical switching device.

Keywords

Single XRD, α-Glycine, UV Spectrum, Z-scan, Crystal Growth

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V. Natarajan ¹, T. Sivanesan ², S. Pandi ³

Affiliations
1 Department of Physics, Rajalakshmi Institute of Technology, Kuthampakkam – 602 107, Chennai, IN
2 Department of Physics Aksheyaa College of Engineering, Puludivakkam – 603 314, Kanchipuram Dt., IN
3 Head Department of Physics, Presidency College, Chennai – 600 005, IN

Abstract

Potassium aluminum sulphate dodeca hydrate crystals were grown from aqueous solution and studied by X-ray diffraction. The UV-Visual IR transmission spectra indicate a better transparency between 200 and 800 nm. The nonlinear refractive index n₂ and susceptibility χ⁽³⁾ have been measured through the Z-scan technique. The results indicate that the compound exhibits saturation absorption and self-focusing performance. Non-linear absorption Co-efficient β is determined as 7.6746 x 10 ^-4 cm/W. Non-linear refractive index n₂ measured at the wavelength of 632.8 nm is calculated as 1.46412 x 10^-8 cm²/W. The real and imaginary pars of χ⁽³⁾ have been measured at 632.8 nm and found to be 7.84088 x 10^-07 esu and 2.07218 x 10^-08 esu, respectively. The measured 3rd order non-linear properties confirm its suitability for nonlinear optical devices such as optical limiting and switching.

Keywords

Growth from Solution, Single XRD, UV Spectrum, Z-scan

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S. Janarthanan ¹, Y. C. Rajan ², P. R. Umarani ¹, D. Jayaraman ¹, D. Premanand ³, S. Pandi ¹

Affiliations
1 Department of Physics, Presidency College, Chennai-600 005, Tamilnadu, IN
2 Department of Materials Science and Engineering, National Chiauo Tung University, TW
3 Department of Physics, St. Xavier’s College, Polyamkottai, Tirnelveli, Tamilnadu, IN

Abstract

The semicarbazone of p-anisaldehyde (SPAS) is a novel organic nonlinear optical material. The SPAS has been synthesized and the solubility studies were carried out in the temperature range 30-60 °C. Single crystals of SPAS have been grown following the slow evaporation technique and the unit cell parameters have been evaluated by single crystal X-ray diffraction technique. The UV-Visible, FT-IR and 1HNMR spectra have been recorded to characterize the grown crystal. The thermogravimetric and differential thermal analysis of the grown crystal revealed that there is no phase transformation in SPAS, and its thermal stability was found to be good. The dielectric measurement was made as a function of frequency (50 Hz - 5 MHz). The second harmonic generation in the sample was confirmed by the Kurtz powder technique.

Keywords

Crystal Growth, XRD, Solution Growth, Thermal Studies, Dielectric Studies

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V. Natarajan ¹, T. Sivanesan ², S. Pandi ³

Affiliations
1 Dept. of Physics, Rajalakshmi Institute of Technology, Kunthampakkam-602124, TN, IN
2 Dept. of Physics, Aksheyaa College of Engineering, Puluthivakkam, Kanchipuram 603 314, TN, IN
3 Dept. of Physics, Presidency College, Chennai- 600 005, IN

Abstract

L-arginine hydrochloride monohydrate (L-arginine hydrochloride monohydrate) was synthesized by the reaction between hydrochloric acid and the strongly basic amino acid, L-arginine taken in the ratio of 1:1. The crystal structure of the sample was studied by single X-ray diffraction. The UV transmittance spectra of the grown crystals indicate a good transparency between 200 and 1000 nm. The nonlinear refractive index η₂ and susceptibility χ⁽³⁾ have been measured through the Z-scan technique. The results indicate that the compound exhibits reverse saturation absorption and selfdefocusing performance. Non-linear absorption co-efficient is determined as 9.2194 x 10^{- 4} cm/w. The non-linear refractive index of the L-arginine hydrochloride single crystals were found to be 1.7129 x 10^{- 7}cm ²/w. The real and imaginary pars of non-linear susceptibility χ(3) have been measured at 632.8 nm and found to be 1.1573 x 10^-05 esu and 3.1382 x 10^-05 esu, respectively.

Keywords

Growth from Solution, Single XRD, UV Spectrum, Z-scan

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