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当共线传输的双色强激光脉冲满足时间重叠时,其等离子体通道间将出现强烈的耦合作用,由此引起的交叉相位调制可产生强烈的非线性效应,使紫外超短脉冲的频谱展宽效应得到增强.将由钛宝石激光系统经三倍频得到的能量为0.45mJ、带宽为1.5nm的紫外脉冲和能量为7.1mJ的近红外脉冲共线聚焦后,在氩气样品池中分别诱导产生等离子体通道,发现紫外脉冲光谱受到明显调制.调制后的光谱半高全宽增至6.4nm,为聚焦前谱宽的4倍,是单束紫外脉冲成丝时谱宽的2.5倍.实验着重研究在不同时间延迟、耦合位置和气体压强情况下,双色光丝在氩气中的紫外频谱演化规律,为紫外波段极端超快激光脉冲的获得提供了有效依据.
When the two-color intense laser pulses transmitted by the collinear lines satisfy the overlapped time, there will be a strong coupling effect between the plasma channels. The resulting cross-phase modulation can produce a strong nonlinear effect so that the spectral broadening effect of ultrashort UV pulses Was enhanced by the titanium laser system by three times the energy is 0.45mJ, a bandwidth of 1.5nm UV pulses and near-infrared energy 7.1mJ pulses collinearly focused, were induced in the argon sample cell plasma The results showed that the UV pulse spectrum was obviously modulated.The FWHM of the modulated spectrum increased to 6.4 nm, which was four times of the pre-focusing spectral width and 2.5 times of the spectral width of single-beam UV pulsed filaments.The experiment focused on the different Under the condition of time delay, coupling position and gas pressure, the evolution rule of the two-color optical fiber in argon gas spectrum provides an effective basis for the acquisition of ultrafast laser pulses in the ultraviolet region.