title: Two-photon absorption spectra of pyrylium derivatives.
authors.affiliation: School of Physics and Microelectronics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, P. R. China.
authors.forename: Yu-fang
authors.initials: YF
authors.lastname: Zhou
authors.forename: Sheng-yu
authors.initials: SY
authors.lastname: Feng