## Abstract

The second-harmonic nonlinear optical susceptibility tensor of $(-)2$-*α*-(methylbenzylamino)-5-nitropyridine single crystals has been calculated from electric-field-induced second-harmonic generation (SHG) data and the oriented-gas model. From this tensor the calculated value of the maximum effective nonlinear optical susceptibility ${d}_{\mathrm{eff}}$ for phase-matched SHG was found to be $6.5\mathrm{pm}{\mathrm{V}}^{-1}.$ Calculations along the whole of the phase-matching locus show that the highest value of ${d}_{\mathrm{eff}}$ is in the region of the lowest values of the second-harmonic wave beam walk-off angle. The walk-off angle of the fundamental is approximately five times smaller. A theory necessary for the optimization of SHG efficiency in biaxial crystals is developed and it is shown that, for the range of crystal lengths and beam walk-off angles available, the criteria for the selection of the parameters ${w}_{0},$
${z}_{0},$ and $\mathrm{\Delta}k$ for optimization of the second-harmonic signal are the same in biaxial and uniaxial crystals. The optimal configuration for the highest second-harmonic efficiency on the phase-matching locus has been determined. The maximum SHG figure of merit, ${P}_{2\omega}(\mathcal{l})/{P}_{\omega}^{2}(0),$ is found to be $3.7\times {10}^{-3}{\mathrm{W}}^{-1}$ for a 50-mm-long crystal.

© 1998 Optical Society of America

Full Article | PDF Article**OSA Recommended Articles**

P. Kerkoc, S. Horinouchi, K. Sasaki, Y. Nagae, and D. Pugh

J. Opt. Soc. Am. B **16**(10) 1686-1691 (1999)

R. T. Bailey, F. R. Cruickshank, P. Kerkoc, D. Pugh, and J. N. Sherwood

Appl. Opt. **34**(7) 1239-1244 (1995)

Yanqing Liu, Hongwei Qi, Qingming Lu, Fapeng Yu, Zhengping Wang, Xinguang Xu, and Xian Zhao

Opt. Express **23**(3) 2163-2173 (2015)