CAJ | 학술논문

采用中心波长800 nm、脉宽30 fs的超短激光脉冲,通过飞秒光开关技术对CS_2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:30 fs的超短激光脉冲激发CS_2的克尔信号主要是源于光诱导双折射效应,而非用200 fs的超短激光脉冲时来自瞬态栅的自衍射效应.
채용중심파장800 nm、맥관30 fs적초단격광맥충,통과비초광개관기술대CS_2적비초초쾌비선성특성진행료실험연구.재탐측광강여추운광강비위1∶10시,득도료교이상적광극이시간분변곡선.통과실험측정적광극이신호강도여격발광화탐측광편진방향협각적의뢰관계표명:30 fs적초단격광맥충격발CS_2적극이신호주요시원우광유도쌍절사효응,이비용200 fs적초단격광맥충시래자순태책적자연사효응.
The ultrafast nonlinear optical properties in liquid CS_2 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.