Influence of Picric Acid on the SHG Efficiency of L-Prolinium Tartrate Crystals

S. Natarajan, K. Moovendaran, J. Kalyana Sundar, G. Bhagavannarayana, S.A. Martin Britto Dhas

Material Characterization Division, National Physical Laboratory, New Delhi 110012, India.
School of Physics, Madurai Kamaraj University, Madurai-625 021, India.

DOI: 10.4236/jmmce.2011.1010071                

Abstract

Single crystals of the NLO material L-Prolinium tartrate (LPT) have been grown in the presence and absence of picric acid, by slow evaporation technique. Good quality crystals were harvested within 30 days. The grown crystals were characterized by single crystal X-ray diffraction. The quality of the crystals grown in the presence and absence of picric acid was examined by high resolution X-ray diffractometry (HRXRD). Fourier transform infrared spectroscopy (FTIR) and Fourier transform Raman spectroscopy were used to confirm the presence of the functional groups of L-Prolinium tartrate and the absence of picric acid in the crystals. The thermal stability and the trend of decomposition of the grown crystals were analyzed by thermo gravimetric analysis (TGA). The influence of picric acid on the second harmonic generation efficiency was studied by Kurtz and Perry method. It was observed that the SHG efficiency increased by about 2.3 times compared to that of normal LPT crystals. The results are discussed in detail.

Keywords

organic compounds; crystal growth; X-ray diffraction; thermo-gravimetricanalysis

Conflicts of Interest

The authors declare no conflicts of interest.

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