Efficient (∼10%) Generation of Vacuum Ultraviolet Femtosecond Pulses via Four-Wave Mixing in Hollow-Core Fibers

2024/02/10 by Ruaridh Forbes, Paul Hockett, Forbes, Ruaridh +5 · 1 citation
Engineering · Physics and Astronomy · #Advanced Fiber Laser Technologies #FOS: Physical sciences #Laser-Matter Interactions and Applications #Optics (physics.optics) #Photonic Crystal and Fiber Optics

paper · pdf · doi:10.48550/arxiv.2402.07056

openalex publication_date 2024/02/10 · openalex created_date 2024/02/14 · openalex updated_date 2026/07/31

Abstract

We report the generation of the 5th harmonic of Ti:sapphire, at 160 nm, with more than 4~μJ of pulse energy, and a pulse length of 37 fs with a 1 kHz repetition rate. The VUV pulses are produced using Four-Wave Difference Frequency Mixing (FWDFM) in a helium-filled stretched Hollow-Core Fiber (HCF), driven by a pump at 267 nm and seeded at 800 nm. Guided by simulations using Luna.jl, we are able to optimize the process carefully. The result is a conversion efficiency of ∼10% from the 267 nm pump beam, rivaling the efficient optical mixing schemes in nonlinear crystals.

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