  High-energy ultraviolet pulse generation in gas-filled hollow capillary
fibers (HCFs) through dispersive-wave-emission process, has attracted
considerable attentions in recent several years due to its great application
potentials in ultraviolet spectroscopy and photochemistry. While the ability of
this technique to deliver high-energy, ultrafast ultraviolet pulses is widely
recognized, few-fs duration of {\mu}J-level dispersive-wave (DW) pulses has,
however, escaped direct measurements. In this letter, we demonstrate that using
several chirped mirrors, few-fs ultraviolet DW pulses can be obtained in
atmosphere environment without the use of vacuum chambers. The pulse temporal
profiles, measured using a self-diffraction frequency-resolved optical gating
set-up, exhibit full-width-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 HCF length on temporal width and shape of the measured DW pulses. The
ultraviolet pulses obtained in atmosphere environment with {\mu}J-level pulse
energy, few-fs pulse width and broadband wavelength tunability are ready to be
used in many applications.
