We investigate the optical Kerr effect and third harmonic generation (THG) arising from χ(3) of poly(9,9-dioctylfluorence), which is an emerging organic π -conjugated polymer from the perspective of diverse optoelectronic applications. The measured nonlinear refractive index, obtained with closed-aperture Z-scan, is n2 = (2.04±0.10) × 10-12 esu at λ=1540 nm. Open-aperture Z-scan yields the three-photon absorption coefficient of γ= (1.88±0.26) × 10-3 cm3 / GW2 at λ=1064 nm, arising from χ(5) response. The wavelength-dependent THG indicates that this semiconducting polymer can be a potentially useful polymer system for nonlinear-optics applications involving high-order optical processes in the mid-IR range.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)