Two-photon absorption standards in the 550-1600 nm excitation wavelength range

We present absolute two-photon absorption (2PA) spectra of 15 commercial organic dyes covering an extended range of excitation wavelengths, 550-1600 nm. The 2PA is measured with an estimated accuracy +/- 10% using a femtosecond fluorescence excitation method. The data are corrected for the variations of the pulse duration and the beam profile with the excitation wavelength, and are applicable as reference standards for 2PA measurements. (C) 2008 Optical Society of America.