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

We report experimental generation and numerical simulations of deep ultraviolet (DUV) dispersive waves in a tapered single-ring anti-resonant hollow-core fiber. Using multi-pass cell compression technology, we compress Yb-doped laser pulses to 35 fs. These pulses, with energies in the microjoule range, propagate through a tapered single-ring hollow core photonic crystal fibers (SR-PCF), where tunable DUV pulses in the 202 nm to 210 nm wavelength range are generated under 6-7 bar argon. Both experimental and simulation results demonstrate that the tapering process helps reduce the detrimental influence of resonant bands, enabling more efficient extension of the ultraviolet spectrum. The experimental setup is straightforward and compact, making it feasible for the development of table-top devices for DUV generation that could address specific requirements in medical and spectroscopy applications.