Open AccessSpectral broadening in femtosecond pulse written filamentary waveguides in periodically poled lithium niobate
Author(s) -
Shuofan Zhang,
Wenchao You,
X. R.,
Q. Y. Wang
Publication year - 2014
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.016222
Subject(s) - lithium niobate , optics , materials science , femtosecond , doppler broadening , waveguide , femtosecond pulse , diffraction , nonlinear optics , excitation , optoelectronics , laser , spectral line , physics , quantum mechanics , astronomy
The authors report the filamentary waveguide formation and the significant spectral broadening based on periodically poled lithium niobate substrate. The modified morphology contributes to the combined effects of optical diffraction and self-focusing with the dependence on pulse intensity. Up to 4 times broadening of the FF wave and about 47 nm spanning of the SH wave with the pump power of 19.5 mW are achievable under 1550 nm excitation. Spectral evolution by cubic nonlinearity inside the waveguide has been obtained numerically, and provides a reasonable agreement with the experimental results.