Multi-stage generation of extreme ultraviolet dispersive waves by tapering gas-filled hollow-core anti-resonant fibers

Abstract

M. (2018). Multistage generation of extreme ultraviolet dispersive waves by tapering gas-filled hollow-core anti-resonant fibers.Abstract: In this work, we numerically investigate an experimentally feasible design of a tapered Ne-filled hollow-core anti-resonant fiber and we report multi-stage generation of dispersive waves (DWs) in the range 90-120 nm, well into the extreme ultraviolet (UV) region. The simulations assume a 800 nm pump pulse with 30 fs 10 µJ pulse energy, launched into a 9 bar Ne-filled fiber with a 34 µm initial core diameter that is then tapered to a 10 µm core diameter. The simulations were performed using a new model that provides a realistic description of both loss and dispersion of the resonant and anti-resonant spectral bands of the fiber, and also importantly includes the material loss of silica in the UV. We show that by first generating solitons that emit DWs in the far-UV region in the pre-taper section, optimization of the following taper structure can allow re-collision with the solitons and further up-conversion of the far-UV DWs to the extreme-UV with energies up to 190 nJ in the 90-120 nm range. This process provides a new way to generate light in the extreme-UV spectral range using relatively low gas pressure.

Deep-UV to Mid-IR Supercontinuum Generation driven by Mid-IR Ultrashort Pulses in a Gas-filled Hollow-core Fiber

“…The main reasons are because they offer a weak anomalous dispersion which compensates the normal dispersion of the filling gas, but more importantly they can tolerate extremely high terawatt levels of peak power due to low modal overlap with the silica cladding. Many impressive feats have been demonstrated in hollow core fibers, such as tunable and broadband DUV/Vacuum UV light generation by tuning the gas pressure inside the fiber 14,15,22–26 , four-wave mixing 27 , pulse compression in the mid-IR 28 , Raman effects 29–31 and multistage generation of extreme UV by tapering of HC-ARF 32 . Most of the experimental papers so far report on pumping a gas-filled HC-ARF in the visible and near-infrared regime close to the zero-dispersion wavelength (ZDW) of the fiber.…”

Single-mode, low loss hollow-core anti-resonant fiber designs

“…A unique and striking feature of hollow-core fiber is that most of the light (>99.99%) can be guided in the central air-core with only a tiny fraction of light overlapping with the surrounding glass structure, hence increasing the optical damage threshold and reducing material absorption significantly [4][5][6]10,11]. These fibers have found numerous applications including high power delivery [12], ultra-short pulse delivery [13], pulse compression [14], mid-infrared (mid-IR) transmission [15], terahertz guidance [16], and gas-based nonlinear optics [17][18][19][20][21][22][23][24][25]. In general, based on the guidance mechanism, there are two types of hollow-core fibers which have been proposed.…”

Towards an all-fiber system for detection and monitoring of ammonia

“…From Eq. 1, it is clear that increasing the length of the fiber allows the detection of lower concentrations of gas, as previously demonstrated in polymer fibers 18 . In our work, the lengths of the fiber were varied from 45 cm to 15 cm, the filling time was found to be about 8 seconds for the 45 cm length, and <5 seconds for the 15 cm long fiber.…”

“…Above all, the possibility of light-matter interaction within the core of these fibers (both HC-PBG and antiresonant) is of great importance for gas sensing applications. This technology has also recently enabled their use for extreme gas-based nonlinear optics covering the extreme ultraviolet up to mid-IR spectral region [18][19][20][21] .…”