用Z扫描方法测量掺C_(60)有机改良介质的非线性折射率

Measurement of the Nonlinearities of C 60 Doped Ormosil with Z Scan Method

用Ｚ扫描方法和波长１．０６４μｍ、脉宽１５０ｐｓ的锁模激光测定了Ｃ６０／ＮＨ２－（ＣＨ２）３－Ｓｉ（ＯＣ２Ｈ５）３（简称Ｃ６０／ＫＨ５５０）溶胶和凝胶的三阶光学非线性系数。理论拟合曲线计算得出，溶胶复合材料的非线性折射率ｎ２＝５．６×１０－１２ｅｓｕ，经两天凝结之后的凝胶复合材料的ｎ２＝６．２×１０－１２ｅｓｕ。在相同的激光强度下溶胶和凝胶的不同透过率归因于溶胶液体对激光的非线性散射。

The optical nonlinearities of C 60 /NH 2 (CH 2) 3 Si(OC 2H 5) 3 sol and gel excited by a Nd∶YAG laser with 150 ps pulse duration, 1.06 μm wavelength and 1 Hz repeation were measured using Z scan technique. Theoretical fits from the data give the value of n 2=5.6×10 -12 esu for the sol and 6.2×10 -12 esu for the gel. In addition, the more higher laser transmission of the gel at the focus than that of the sol was attributed to the strong nonlinear scattering of the sol.