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中文摘要：
采用420μm纤芯直径、18cm长的空心光纤作为探测器，在强飞秒激光在氩气中成丝的条件下，研究了成丝不同部位的光谱变化．实验结果表明由于成丝范围内不同部位的脉冲宽度不一样，导致空心光纤位于成丝的不同位置时所获得的光谱展宽也不尽相同．在成丝长度范围内的特定位置可以将50fs入射脉冲最窄压缩至24．8fs．
英文摘要：
Spectrum evolution in the filament was experimentally demonstrated with a 420 μm diameter, 18cm length hollow fiber. The experimental results show that the spectrum evolution in filamentation result from the different pulse duration along the filamentation. In our experiment, at a particular position of the filament, the pulse can be compressed to 24.8 fs from 50 fs of the incident pulse.
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