对高能量飞秒脉冲在充氩气玻璃管中自由成丝以及有空心毛细管束缚成丝两种情况下,输入脉冲能量和空心毛细管所处成丝位置等实验参数对光谱展宽的影响进行了系统的实验研究。结果表明采用空心毛细管束缚成丝。可以使被展宽光谱在短波方向上的强度获得改善。这为进一步脉冲压缩产生高能量单周期飞秒脉冲打下基础。
Filamentation with and without capillary restriction by focusing intense femtosecond pulses into the Argon-filled tube was experimentally studied in this paper. The results showed that the width of the broadened spectrum was affected by the input pulse energy and position of the capillary with respect to the filament. It was also indicated that the intensity of the short wavelength region of the spectrum was enhanced by the capillary restriction, which would be favorable to obtaining intense, monocycle pulses after compression.