飞秒激光在不同位置温度梯度的惰性气体中成丝及光谱展宽的差异

Difference in filament and spectrum broadening induced by femtosecond pulses in argon gas with a temperature gradient at different positions

通过对密闭气体的前端、中端和后端不同位置进行加热处理,使密闭气体内部不同位置呈现温度梯度,对比了不同位置温度梯度对成丝及光谱展宽的影响.实验结果表明对气体不同位置加热都可以实现成丝状态的转变,但相对来讲最佳方案是加热中心位置位于焦点处,从而使温度梯度方案效果得到最大实现.同时,随着温度的增加光谱有逐渐变窄的趋势.

By increasing the local temperature at different positions along the argon gas-filled tube, the difference in filament and spectrum broadening was compared in this paper. The experimental results show that the filament can be controlled by increasing the local temperature of the gas-filled tube. The best way to realise the maximum of such a influence is to heat at the focus point. Spectrum broadening will be narrow with the increase of the local temperature.