Generation of few-cycle laser pulses: Comparison between atomic and molecular gases in a hollow-core fiber

Huang Zhi-Yuan^{1, 2}, Dai Ye¹, Zhao Rui-Rui², Wang Ding^{2, †,}, Leng Yu-Xin^{2, ‡,}

(c) and (g) The spectral profiles of output pulses. (a) and (e), (b) and (f), (d) and (h), represent the evolutions of wavelength shift, broadening factor, and frequency domains for different fiber lengths, respectively. Panels (a)–(d) and (e)–(h) correspond to different delays 4.14 ps and 4.27 ps, together with (blue solid lines) or without (red solid lines) SPM effect.