A new, simple method to measure the nonlinear refraction and absorption of bulk material and waveguides is proposed. The method relies on the evolution of the intensity and width of femtosecond-pulse spectra, owing to self-phase modulation, as a function of variable chirp and stretching introduced at the input.
© 1999 Optical Society of America
F. Louradour, E. Lopez-Lago, V. Couderc, V. Messager, and A. Barthelemy, "Dispersive-scan measurement of the fast component of the third-order nonlinearity of bulk materials and waveguides," Opt. Lett. 24, 1361-1363 (1999)