Open Access
Ultrashort visible energetic pulses generated by nonlinear propagation of necklace beams in capillaries
Author(s) -
Aurora Crego,
Enrique Conejero Jarque,
Julio San Román
Publication year - 2021
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.411338
Subject(s) - necklace , optics , physics , nonlinear system , nonlinear optics , soliton , ultrashort pulse , self phase modulation , doppler broadening , pulse (music) , infrared , laser , spectral line , quantum mechanics , combinatorics , detector , mathematics
The generation of ultrashort visible energetic pulses is investigated numerically by the nonlinear propagation of infrared necklace beams in capillaries. We have developed a (3+1)D model that solves the nonlinear propagation equation, including the complete spatio-temporal dynamics and the azimuthal dependence of these structured beams. Due to their singular nonlinear propagation, the spectrum broadening inside the capillary extends to the visible region in a controlled way, despite the high nonlinearity, avoiding self-focusing. The results indicate that the features of these necklace beams enable the formation of visible pulses with pulse duration below 10 fs and energies of 50 μJ by soliton self-compression dynamics for different gas pressures inside the capillary.