Ultrafast Optical Kerr Effect in Amorphous As2Se3 Film Induced by Ultrashort Laser Pulses

• 来源期刊: 中国物理快报（英文版）
• 学科: 物理学
• 年，卷（期）: 2002,（4）
• 页码范围: 575-577
• 页数: 3页
• 分类号: O4
• 语种: 英文

摘要

Nonresonant third-order nonlinear optical properties of amorphous As2Se3 films were investigated experimentally by the method of femtosecond optical heterodyne detection of the optical Kerr effect at 805 nm with 80 fs ultrafast pulses. The results have shown that the values of real and imaginary components of third-order susceptibility of amorphous As2Se3 films were 5.6×10-12 esu and -2.0×10-13 esu, respectively. Amorphous As2Se3 films demonstrated a very fast response time within 200fs. The ultrafast response and large third-order nonlinearity are attributed to the ultrafast distortion of the electron cloud of As2Se3 films.