Nearly resonant third-order optical non-linearity in c60 cast films



We have carried out measurements of the third-order optical non-linearityX(3) of C60 cast films using the z-scan technique. The measurements have shown that two-photon absorption is the dominant non-linear process around the 3.76 eV absorption region. The real and imaginary parts of X(3) of C60 films have been measured at 665 nm are found to be 2.8 × 10−8 and −3.2 × 10−8 esu respectively.