【摘要】 采用中心波长800nm、脉宽30fs的超短激光脉冲,通过飞秒光开关技术对CS2的飞秒超快非线性特性进行了实验研究.在探测光强与抽运光强比为1∶10时,得到了较理想的光克尔时间分辨曲线.通过实验测定的光克尔信号强度与激发光和探测光偏振方向夹角的依赖关系表明:30fs的超短激光脉冲激发CS2的克尔信号主要是源于光诱导双折射效应,而非用200fs的超短激光脉冲时来自瞬态栅的自衍射效应.更多还原

【Abstract】 The ultrafast nonlinear optical properties in liquid CS2 are investigated by the femtosecond optical Kerr shutter technique at wavelength of 800 nm.Measurements for the dependence of Kerr signals on the polarization angle between the pump and probe beams show that the Kerr signals induced by 30 fs pulse laser arise mainly from the photoinduced birefringence effect,but not from a laser-induced transient grating as absorbed when using a 200 fs pulse laser.The OKE signal intensity increases with the increases of the intensity of pump beam.更多还原