Open AccessDetermination of nonlinear refractive index in a Ta2O5 rib waveguide using self-phase modulation
Author(s) -
Chao-Yi Tai,
James S. Wilkinson,
N.M.B. Perney,
M.C. Netti,
Francesco Cattaneo,
Chris E. Finlayson,
Jeremy J. Baumberg
Publication year - 2004
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/opex.12.005110
Subject(s) - optics , self phase modulation , refractive index , dispersion (optics) , modulation (music) , phase modulation , wavelength , femtosecond , materials science , cross phase modulation , waveguide , phase (matter) , kerr effect , shutter , nonlinear optics , nonlinear system , physics , laser , phase noise , quantum mechanics , acoustics
Self-phase modulation has been observed for ultrashort pulses of wavelength 800nm propagating through a 1 cm-long Ta2O5 rib waveguide. The associated nonlinear refractive index n2 was estimated to be 7.23x10-19 m2/W, which is higher than silica glass by more than one order of magnitude. Femtosecond time of flight measurements based on a Kerr shutter configuration show that the group velocity dispersion is small at a wavelength of 800 nm, confirming that dispersion may be neglected in the estimation of n2 so that a simplified theory can be used with good accuracy.
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