中国物理B ›› 2017, Vol. 26 ›› Issue (1): 14208-014208.doi: 10.1088/1674-1056/26/1/014208
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
Rui-rui Zhao(赵睿睿), Ding Wang(王丁), Zhi-yuan Huang(黄志远), Yu-xin Leng(冷雨欣), Ru-xin Li(李儒新)
Rui-rui Zhao(赵睿睿)1,2, Ding Wang(王丁)1, Zhi-yuan Huang(黄志远)1, Yu-xin Leng(冷雨欣)1, Ru-xin Li(李儒新)1
摘要: We numerically study the propagation dynamics of intense optical pulses in gas-filled hollow-core fibers (HCFs). The spatiotemporal dynamics of the pulses show a transition from tightly confined to loosely confined characteristics as the fiber core is increased, which manifests as a deterioration in the spatiotemporal uniformity of the beam. It is found that using the gas pressure gradient does not enhance the beam quality in large-core HCFs, while inducing a positive chirp in the pulse to lower the peak power can improve the beam quality. This indicates that the self-focusing effect in the HCFs is the main driving force for the propagation dynamics. It also suggests that pulses at longer wavelengths are more suitable for HCFs with large cores because of the lower critical power of self-focusing, which is justified by the numerical simulations. These results will benefit the generation of energetic few-cycle pulses in large-core HCFs.
中图分类号: (Ultrafast processes; optical pulse generation and pulse compression)