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The ground-state bleaching of highly concentrated rhodamine 6G solutions in methanol is studied with intense picosecond light pulses. The ground-state recovery time changes with concentration from about 3.9 ns at low concentration (10-5 mol/dm3) to about 1 ps at high concentration (0.6 mol/dm3). The shortening of the absorption recovery time is determined by the concentration dependent quenching of theS1-state population due to unbound dimers and by the intensity dependent longitudinal and transverse amplified spontaneous emission.

Saturable absorbers with concentration-dependent absorption recovery time