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Optical limiting effect in a two-photon absorption dye doped solid matrix
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1995
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Optical MaterialsEngineeringEpoxy MatrixLaser ApplicationsLaser MaterialChemistryHigh-power LasersOptical PropertiesAspt-doped Epoxy RodSolid MatrixPhotophysical PropertyOptical PumpingPhotonicsChemical LasersPhysicsPhotochemistryTwo-photon Absorption DyePhotonic MaterialsPhotonic DeviceLaser PhotochemistryNatural SciencesOptical PhysicApplied PhysicsTpa MechanismLight AbsorptionOptoelectronics
We recently reported a new lasing dye, trans-4-[p-(N-ethyl-N-hydroxylethylamino)styryl]-N-methylpyridinium tetraphenylborate (ASPT), which has also been shown to possess a strong two-photon absorption (TPA) and subsequent frequency upconversion fluorescence behavior when excited with near infrared laser radiation. Based on the TPA mechanism, a highly efficient optical limiting performance has been demonstrated in a 2 cm long ASPT-doped epoxy rod pumped with 1.06 μm Q-switched laser pulses at 50–250 MW/cm2 intensity levels. The measured nonlinear absorption coefficient reached 6 cm/GW for the tested sample of dopant concentration d0=4×10−3 M/L. The molecular TPA cross section of ASPT in the epoxy matrix is estimated as σ2=2.5×10−18 cm4/GW or σ2′=4.7×10−46 cm4/photon/s, respectively. Two-photon pumped cavity lasing is also observed in an ASPT-doped polymer rod.