高濃度Erドープガラスにおける1.5μm帯の光双安定性及び負性非線形吸収効果

概要

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The dependence of the negative nonlinear absorption effect at 1.5 μm on the sample temperature, the modulation frequency and the sample length were investigated in glasses containing amounts higher than 20 mol% Er^<3+>. Reversed-phase waveforms were observed in the temperature range -260-600℃ and at modulation frequencies from 1 kHz to 10 GHz in an erbium-doped phosphate glass. With increasing temperature, the amplitude of the reversed-phase waveforms decreases exponentially according to two separate steps. Optical bistability in the transmitted laser was observed in the range of incident laser intensity of 30 μW/cm^2-2.4 mW/cm^2. The transmitted laser intensity propagating through the glass decreased exponentially according to the well-known exponential law. However, the amplitude of the optical bistability increased logarithmically as the sample length was increased. The negative nonlinear absorption effect can be explained by considering an enhanced absorption model for a four-level system of the Er^<3+> ion.
社団法人日本セラミックス協会の論文
2000-06-01