Measurement of nondegenerate nonlinearities using a two-color Z scan.
A simple dual-wavelength (two-color) Z-scan geometry is demonstrated for measuring nonlinearities at frequency omega(p) owing to the presence of light at omega(e). This technique gives the nondegenerate two-photon absorption (2PA) coefficient beta(omega(p); omega(e)) and the nondegenerate nonlinear refractive index n(2)(omega(p); omega(e)), i.e., cross-phase modulation. We demonstrate this technique on CS(2) for n(2) and on ZnSe where 2PA and n(2) are present simultaneously.
M
M
Sheik-Bahae
J
J
Wang
R
R
Desalvo
D J
DJ
Hagan
E W
EW
Stryland