Dispersion of the two-photon cross section in rhodamine dyes

S0-Sn Two-Photon Absorption Dynamics of Rhodamine Dyes

“…The best fits of the calculations to the data points give the two-photon-absorption cross-sections of <T (2) = (1.2 ± 0.2) x 10" 48 cm 4 s for rhodamine B and (1.8 + 0.2) x 10-48 cm 4 s for rhodamine 6G. Our results agree reasonably well with previously reported values of (1.48 ± 0.7) x 10 -48 cm 4 s for rhodamine B and (3.55 ± 1.7) x 10~4 8 cm 4 s for rhodamine 6G [3]. The backward energy transmission of a reflected weak probe pulse (frequency v L , distance between end of sample and reflection glass plate 1.2 cm, reflection factor 0.04) as a function of input pump-pulse intensity (duration At L = 30 ps) is shown in Fig.…”

“…Only isotropic single-photon and two-photon absorption cross-sections are considered, i.e. absorption anisotropy of two-photon [3,26] and of single photon processes [27,28] is neglected. The system of equations reads dt' …”

“…Two-photon absorption cross-sections G {2) were determined for various dyes [1][2][3][4][5][6][7]. The fluorescence induced by two-photon absorption has found wide application in picosecond-pulse duration measurements [8].…”

“…Deviations of the two-photon excited-fluorescence signal from the expected quadratic dependence on pump-laser intensity has been observed indicating the simultaneous action of additional spectroscopic effects (excited-state absorption, stimulated emission, etc.) [2,3,[11][12][13][14][15].…”

S0-S n two-photon absorption dynamics of rhodamine dyes

“…The two-photon absorption of dye solutions at elevated laser intensities has been studied previously by fluorescence observation [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Two-photon absorption cross-sections G {2) were determined for various dyes [1][2][3][4][5][6][7].…”