Ultrafast nonlinear optical response of Ag:BaTiO_3 composite films at the near-ultraviolet wavelengths  

作　　者：关东仪 陈正豪 金奎娟 杨国桢 

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics Institute of Physics, Chinese Academy of Science [2]Beijing National Laboratory for Condensed Matter Physics Institute of Physics,Chinese Academy of Science

出　　处：《Chinese Optics Letters》2006年第6期370-372,共3页中国光学快报（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China under Grant No. 10276037.

摘　　要：The ultrafast nonlinear optical response of Ag：BaTiO3 composite films synthesized by pulse laser deposition （PLD） is studied at the near-ultraviolet （400 nm） wavelength. The pulse duration of the laser used in the measurement is 200 fs. The real and imaginary parts of the third-order nonlinear susceptibility x^（3） of the composite materials are measured. The composite films indicate self-focusing effect and nonlinear saturation, the values of Rex^（3） and Imx^（3） are measured to be 3.42 ×10 ^-10 and -1.37 ×10 ^-10 esu respectively, which are much lower than those reported before. It is mainly because that the duration of the laser used in the measurements is too short to induce the hot electron excitation and the thermal effect. The ultrafast nonlinear saturated absorption response of the Ag：BaTiO3 composite films may have potential applications for femtosecond laser mode locking.The ultrafast nonlinear optical response of Ag：BaTiO3 composite films synthesized by pulse laser deposition （PLD） is studied at the near-ultraviolet （400 nm） wavelength. The pulse duration of the laser used in the measurement is 200 fs. The real and imaginary parts of the third-order nonlinear susceptibility x^（3） of the composite materials are measured. The composite films indicate self-focusing effect and nonlinear saturation, the values of Rex^（3） and Imx^（3） are measured to be 3.42 ×10 ^-10 and -1.37 ×10 ^-10 esu respectively, which are much lower than those reported before. It is mainly because that the duration of the laser used in the measurements is too short to induce the hot electron excitation and the thermal effect. The ultrafast nonlinear saturated absorption response of the Ag：BaTiO3 composite films may have potential applications for femtosecond laser mode locking.

关 键 词：Absorption Composite materials Focusing Laser mode locking Pulsed laser deposition Thermal effects 

分 类 号：O437[机械工程—光学工程]