We measured the magnitude and the time response of the nonlinear refractive index (n2) of poly(3-hexylthiophene)by a femtosecond time-resolved interferometric technique. Decays of 320 fs and 3.0 ps were found. The n2 value obtained was -6 × 10-9 esu at 620 nm. Calculation of the dispersion of n2 showed that the negative value is consistent with that of a four-level model.
© 1992 Optical Society of America
Toshiaki Hattori, Haruki Okawa, Tatsuo Wada, and Hiroyuki Sasabe, "Subpicosecond interferometric measurement of the nonlinear refractive index of poly(3-hexylthiophene)," Opt. Lett. 17, 1560-1562 (1992)