Z-掃描技術研究□花青染料聚合物與共聚物之三階非線性光學性質

Abstract

本實驗的目的在研究□花青染料聚合物與共聚物之三階非線性光學性質，如非線性折射率與非線性吸收係數，於論文中擬用量測方法為Z-掃描技術，此法源自於1989年佛羅里達大學CREOL (Center for Research of Electro Optics and the Lasers)。由於目前沒有適當的雷射光源作為Z-描量測用，乃以理論模擬各种可能觀測到的現象，做一分析與討論，其結果如下，當無非線性吸收係數之有孔徑Z-掃描時，可得非線性折射率為n2=±1×10-14cm2/W。非線性折射率與非線性吸收係數共存之有孔徑與無孔徑Z-掃描並行時，當非線性折射率為正可得n2=1×10-14 cm2/W,β=2×10-9 cm/W;當非線性折射率為負可得n2=-1×10-14 cm2/W, β=2×10-9 cm/W。

This study concerns the third-order nonlinear optical properties of silicon phthalocyanine related polymers, such as nonlinear refractive index and absorption coefficient. These properties were investigated by the Z-scan technique and its measuring method, which was originated from CREOL (Center for Research of Electro Optics and the Lasers) in 1989.Currently because there is no appropriate laser source available for the Z-scan measurement, various signs likely observed were thus simulated theoretically for analysis and discussion to obtain the result as following; nonlinear refractive indices of n2=±1×10-14 cm2/W were obtained from the aperture Z-scan of a sample without nonlinear absorption coefficient.For aperture and nonaperture Z-scans of samples of the coexistance of nonlinear refractive index and absorption coefficient, a nonlinear absorption coefficient of β=2×10-9 cm/W was obtained when the nonlinear refractive index is positive with n2-1×10-14 cm2/W, while the nonlinear refractive index is negative with n2=-1×10-14cm2/W the nonlinear absorption coefficient thus obtained was β=2×10-9 cm/W.