Generation of deep ultraviolet dispersive waves in the tapered anti-resonant hollow-core fiber

We report experimental and numerical simulations on the generation of Deep Ultraviolet (DUV) dispersive waves in a tapered single-ring anti-resonant hollow-core fiber. Initially, we utilize the multi-pass cell compression technology to shorten the Yb-doped laser pulse duration to 35 fs, followed by driving a short piece of tapered anti-resonance fiber with several microjoules of energy, we achieve tunable DUV pulses in the 202 nm to 210 nm wavelength range under moderate gas pressures of six to seven bar. Both experimental and simulation results demonstrate that the tapering process helps reduce the detrimental influence of resonant bands, which otherwise hinder efficient dispersive wave generation. The experimental setup is straightforward and compact, making it feasible for the development of table-top devices for DUV generation, which could address specific requirements in medical and spectroscopy applications.