Energetic few-cycle pulse compression in gas-filled hollow core fiber with concentric phase mask

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

Normalized spatial intensity profiles of compressed pulses with input energy values ranging from 5.0 mJ to 20.0 mJ, corresponding to scenarios in panels (a)–(d).