Comparative study of spectral broadening and few-cycle compression of Yb:KGW laser pulses in gas-filled hollow-core fibers

Shalaby, Islam; McDonnell, Michael; Murphy, Colin; Chakraborty, Nisnat; Gray, Kody; Wood, James; Biswas, Dipayan; Sandhu, Arvinder

doi:10.1364/OPTCON.550744

Comparative study of spectral broadening and few-cycle compression of Yb:KGW laser pulses in gas-filled hollow-core fibers

Journal Article · Wed Jan 29 00:00:00 EST 2025 · Optics Continuum

DOI:https://doi.org/10.1364/OPTCON.550744· OSTI ID:2507385

; ; Murphy, Colin; Chakraborty, Nisnat; ; ; Biswas, Dipayan;

While industrial-grade Yb-based amplifiers have become very prevalent, their limited gain bandwidth has created a large demand for robust spectral broadening techniques that allow for few-cycle pulse compression. In this work, we perform a comparative study between several atomic and molecular gases as media for spectral broadening in a hollow-core fiber geometry. Exploiting nonlinearities such as self-phase modulation, self-steepening, and stimulated Raman scattering, we explore the extent of spectral broadening and its dependence on gas pressure, the critical power for self-focusing, and the optimal regime for few-cycle pulse compression. Using a 3-mJ, 200-fs input laser pulses, we achieve 17 fs, few-cycle pulses with 80% fiber energy transmission efficiency. The optimal parameters can be scaled for higher or lower input pulse energies with appropriate gas parameters and fiber geometry.

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Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0018251

OSTI ID:: 2507385

Journal Information:: Optics Continuum, Journal Name: Optics Continuum Journal Issue: 2 Vol. 4; ISSN 2770-0208

Publisher:: Optical Society of AmericaCopyright Statement

Country of Publication:: United States

Language:: English

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