Measurements of microjoule-level, few-femtosecond ultraviolet dispersive-wave pulses generated in gas-filled hollow capillary fibers

To the best of our knowledge, we demonstrate the first time-domain measurement of mu J-level, few-fs ultraviolet dispersive-wave (DW) pulses generated in gas-filled hollow capillary fibers (HUN) in an atmosphere environment using several chirped mirrors. The pulse temporal profiles, measured using a self-diffraction frequency-resolved optical gating setup, exhibit full width at half maximum pulse widths of 9.6 fs at 384 nm and 9.4 fs at 430 nm, close to the Fourier-transform limits. Moreover, theoretical and experimental studies reveal the strong influences of driving pulse energy and Ha' length on temporal width and shape of the measured DW pulses. The ultraviolet pulses obtained in an atmosphere environment with mu J-level pulse energy, few-fs pulse width, and broadband wavelength tunability are ready to be used in many applications. (C) 2022 Optica Publishing Group