Linear and nonlinear optical properties of the organic crystal DSTMS

摘要

We report on the linear and nonlinear optical properties of the novel organic crystal 4-N, N-dimethylamino-4'-N'-methyl-stilbazolium 2,4,6-trimethylbenzenesulfonate (DSTMS). The principal refractive indices n(1), n(2), and n(3) have been determined by a direct measurement of the group index dispersion over a broad wavelength range from 0.6 to 1.6 mu m. The linear absorption coefficients for light polarized along the dielectric axes have been measured in the transparency range from 600 to 2000 run. DSTMS crystals show a large birefringence of Delta n=0.5 and low absorption alpha<0.7 cm(-1) in the telecommunication wavelength range at 1.55 mu m. Furthermore, the nonlinear optical tensor elements d(111), d(122), and d(212) have been determined by the Maker-fringe technique at the fundamental wavelength of 1.9 mu m. DSTMS crystals exhibit a very large nonlinear activity with a nonlinear optical coefficient d(111)=214 +/- 20 pm/V. Phase-matching curves determined from our optical data showed that parametric oscillation can be achieved in the wavelength range from 1 to 2.2 mu m with effective nonlinear optical coefficients larger than 25 pm/V. (C) 2007 Optical Society of America.