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

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...

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Bibliographic Details
Published in:arXiv.org 2024-11
Main Authors: Shalaby, Islam, McDonnell, Michael, Murphy, Colin, Chakraborty, Nisnat, Gray, Kody, Wood, James, Biswas, Dipayan, Sandhu, Arvinder
Format: Article
Language:English
Subjects:
Comparative studies
Energy transmission
Gas pressure
Molecular gases
Parameters
Phase modulation
Pressure dependence
Pulse compression
Raman spectra
Transmission efficiency
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Summary: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 ~ 15 fs, few-cycle pulses with >70% overall energy transmission efficiency. The optimal parameters can be scaled for higher or lower input pulse energies with appropriate gas parameters and fiber geometry.
ISSN:2331-8422