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Thermal effects in molecular gas-filled hollow-core fibers
Author(s) -
John E. Beetar,
M. Nrisimhamurty,
Tran-Chau Truong,
Yangyang Liu,
Michael Chini
Publication year - 2021
Publication title -
optics letters/optics index
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.524
H-Index - 272
eISSN - 1071-2763
pISSN - 0146-9592
DOI - 10.1364/ol.422983
Subject(s) - laser , materials science , excitation , analytical chemistry (journal) , optics , physics , chemistry , chromatography , quantum mechanics
Few-cycle sources with high average powers are required for applications to attosecond science. Raman-enhanced spectral broadening of Yb-doped laser amplifiers in molecular gases can yield few-cycle pulses, but thermal excitation of vibrational and rotational degrees of freedom may preclude high-power operation. Here we investigate changes in the spectral broadening associated with repetitive laser interactions in an ${{\rm{N}}_2}{\rm{O}}$-filled hollow-core fiber. By comparing experimental measurements of the spectrum associated with each laser pulse to simulations based on a density matrix model, we find that losses in a spectral bandwidth and transmission are largely dominated by thermal excitation of the gas.

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