Department of Physics, Arignar Anna Government Arts College, Cheyyar 604 407, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2013 Oct;114:19-26. doi: 10.1016/j.saa.2013.05.017. Epub 2013 May 17.
An efficient amino acid family nonlinear optical single crystal L-phenylalanine-benzoic acid (LPB) was conveniently grown by slow evaporation technique at room temperature. The crystal system and the lattice parameters were analyzed by single crystal X-ray diffraction studies. The grown crystal has excellent transmission in the entire visible region and its lower cut-off wavelength was found to be 248 nm. The SHG efficiency of the grown crystal was found to be 1.6 times higher than that of KDP crystal. The Laser damage threshold value of LPB has been found to be 6.5 GW/cm(2). The sample was thermally stable up to 134°C. Microhardness, dielectric and AC/DC conductivity measurements were made along (001) plane and reported for the first time. Microhardness studies revealed that the sample belongs to hard nature. Frequency dependent dielectric constant was measured for different temperatures and found maximum dielectric constant of 14 for 363 K. Photoconductivity studies of LPB divulged its negative photoconducting nature.
一种高效的氨基酸族非线性光学单晶 L-苯丙氨酸-苯甲酸（LPB）可通过室温下的慢速蒸发技术方便地生长。通过单晶 X 射线衍射研究分析了晶体系统和晶格参数。生长的晶体在整个可见光区域具有优异的透过率，其较低的截止波长为 248nm。发现生长晶体的 SHG 效率比 KDP 晶体高 1.6 倍。LPB 的激光损伤阈值为 6.5GW/cm(2)。该样品在 134°C 下热稳定。首次报道了沿（001）面进行的显微硬度、介电和交流/直流电导率测量。显微硬度研究表明，该样品属于硬性质。测量了不同温度下的频率相关介电常数，发现 363K 时最大介电常数为 14。LPB 的光电导研究揭示了其负光电导性质。
