Ultrafast Optical Kerr Effect in Amorphous As2Se3 Film Induced by Ultrashort Laser Pulses
LIU Qi-Ming1, MI Jun2, QIAN Shi-Xiong2, GAN Fu-Xi1,3
1Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, P. O. Box 800-211, Shanghai 201800
2Department of Physics, Fudan University, Shanghai 200433
3School of Information Science and Technology, Fudan University, Shanghai 200433
Ultrafast Optical Kerr Effect in Amorphous As2Se3 Film Induced by Ultrashort Laser Pulses
LIU Qi-Ming1;MI Jun2;QIAN Shi-Xiong2;GAN Fu-Xi1,3
1Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, P. O. Box 800-211, Shanghai 201800
2Department of Physics, Fudan University, Shanghai 200433
3School of Information Science and Technology, Fudan University, Shanghai 200433
Abstract： Nonresonant third-order nonlinear optical properties of amorphous As2Se3 film were investigated experimentally by the method of the femtosecond optical heterodyne detection of optical Kerr effect at 805 nm with the 80 fs ultrafast pulses. The results showed that the values of real and imaginary components of third-order susceptibility of amorphous As2Se3 film were 5.6 x 10-12 esu and -2.0 x 10-13 esu, respectively. Amorphous As2Se3 film demonstrated a very fast response time within 200 fs. The ultrafast response and large third-order nonlinearity are attributed to the ultrafast distortion of the electron cloud of As2Se3 film.
2002, Vol. 19 
