Spatiotemporal propagation dynamics of intense optical pulses in loosely confined gas-filled hollow-core fibers

doi:10.1088/1674-1056/26/1/014208

Abstract 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.

Keywords: spatiotemporal dynamics hollow-core fiber longer wavelengths

Received: 22 August 2016
Revised: 18 September 2016
Accepted manuscript online:

PACS:	42.65.Re	(Ultrafast processes; optical pulse generation and pulse compression)
	42.65.Jx	(Beam trapping, self-focusing and defocusing; self-phase modulation)
	42.81.Qb	(Fiber waveguides, couplers, and arrays)

Corresponding Authors: Ding Wang, Yu-xin Leng
E-mail: wangding@siom.ac.cn;lengyuxin@mail.siom.ac.cn

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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) Spatiotemporal propagation dynamics of intense optical pulses in loosely confined gas-filled hollow-core fibers 2017 Chin. Phys. B 26 014208

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Spatiotemporal propagation dynamics of intense optical pulses in loosely confined gas-filled hollow-core fibers

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