Open AccessRaman effect in the spectral broadening of ultrashort laser pulses in saturated versus unsaturated hydrocarbon molecules
Author(s) -
Oh-Sang Kwon,
Reza Safaei,
Philippe Lassonde,
Guangyu Fan,
Andrius Baltuška,
Bruno E. Schmidt,
Heide Ibrahim,
François Légaré
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.380941
Subject(s) - materials science , doppler broadening , femtosecond , sapphire , laser , raman scattering , raman spectroscopy , optics , homogeneous broadening , ti:sapphire laser , dispersion (optics) , molecular physics , pulse compression , molecule , spectral line , chemistry , physics , telecommunications , radar , organic chemistry , astronomy , computer science
A conventional hollow core fiber (HCF) scheme is implemented to investigate spectral broadening of Titanium:Sapphire (Ti-Sa) femtosecond laser pulses in saturated hydrocarbon molecules compared to unsaturated ones. While the saturated molecules exhibit a spectral broadening similar to noble gases, for the unsaturated ones with π bonds, broadening towards blue is restrained. Numerical simulations underpin that it is a combination of group velocity dispersion (GVD) and Raman scattering which limits the spectral broadening for the unsaturated molecules. Compression of low energy ∼40fs pulses to ∼8fs using saturated hydrocarbons is demonstrated, suggesting the feasibility of this media for high repetition rate laser pulse compression.