Chinese Optics Letters, 2009, 7 (7): 07653, Published Online: Jul. 24, 2009
Experimental study of the time-resolved reflectivity of chromium film Download: 986次
飞秒激光 泵浦-探测 时间分辨反射率 320.2250 Femtosecond phenomena 320.7160 Ultrafast technology 310.6860 Thin films, optical properties
Abstract
The transient time-resolved reflectivity of chromium film is studied by femtosecond pump-probe technique with a 70-fs laser. Experimental results show that the reflectivity change increases with the power of the pump laser. The fast decrease of the reflectivity occurs between 0-200 fs which is mainly due to the electron-electron interaction. Subsequencely, the slower recovery of the reflectivity between 200-900 fs is mainly due to the electron-phonon coupling process. The reflectivity after 900 fs rises little to a near-constant value for the thermal equilibrium of the system. The experimental results can be explained properly with numerical simulation of the two-temperature model. It is helpful for understanding of the electron ultrafast dynamics in chromium film.
Tengfei Wu, Changhe Zhou, Enwen Dai, Jin Xie. Experimental study of the time-resolved reflectivity of chromium film[J]. Chinese Optics Letters, 2009, 7(7): 07653.