標題: Z-掃描量測碲化鋅之三階非線性效應
Determination of optical nonlinearity of ZnTe by Z-scan technique
作者: 王蒼祺
Tsang-Chi Wang
謝文峰
Wen-Feng Hsieh
光電工程學系
關鍵字: Z-掃描;碲化鋅;非線性折射係數;自旋-軌道偶合能帶;雙光子共振;z-scan;ZnTe;nonlinear refractive index;spin-orbital split band;two photon near resonant
公開日期: 2000
摘要: 利用飛秒超短脈衝鈦藍寶石雷射(波長800nm)從事變化強度Z-掃瞄量測技術研究碲化鋅(Eg=2.26eV)。發現此樣品的非線性折射係數n2約為1.373x10-13cm2/W ,跟一般理論預測在入射光子能量是介於一半能隙和能隙之間時,n2<0,似乎不吻合。認為是自旋-軌道偶合能帶能量接近雙光子共振。非線性吸收係數的增強猜測可能是THz電磁輻射的產生導致。
By using a femtosecond Ti:sapphire laser (wavelength = 800nm) as z-scan source, we have studied intensity dependent nonlinear refractive index of the ZnTe. The positive nonlinear refractive index is observed for n2=1.373x10-13cm2/W. In regime,general theory shows that c(3)<0. The discrepancy of our result with theory is explained by two photon near-resonant to spin-orbital split band transition. Larger nonlinear absorption may be enhanced by THz generation.
URI: http://140.113.39.130/cdrfb3/record/nctu/#NT890614041
http://hdl.handle.net/11536/67925
顯示於類別:畢業論文