Abstract

Two-photon fluorescence (TPF) has been excited in different solutions of rhodamine 6G and rhodamine B with single 30-psec pulses from a Nd:YAG laser at 1.06 μm. Up to incident intensities of 6 × 1028 photons cm−2 sec−1 the TPF intensity showed a quadratic dependence on the photon flux. At higher photon fluxes the TPF intensity increased less than quadratically with the incident intensity. A possible mechanism, not considered previously, for this quenching is stimulated Raman scattering. It was observed that TPF-quenching and stimulated anti-Stokes emission had thresholds in the same power range.

© 1979 Optical Society of America

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