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Dynamics of nonlinear optical response of CuBr-doped glasses
Affiliation:1. Department of Fusion Chemical Engineering, Hanyang University, Ansan 426-791, Republic of Korea;2. Plant Engineering Center, Institute for Advanced Engineering (IAE), Yongin 449-863, Republic of Korea;3. Production Technology R&D Division, Korea Institute of Industrial Technology, Incheon 406-840, Republic of Korea
Abstract:Nonlinear absorption of the Z1,2 exciton band in CuBr-doped glasses was observed at band-to-band excitation and described in terms of damping of the Lorentzian-shaped band. Microcrystal-radius dependent time evolution of the nonlinearity was investigated, and the full recovery of initial absorption was observed to be as short as 20 ps in the smallest microcrystals. Radiative exciton-exciton Interaction and surface recombination were claimed to be the main mechanisms of exciton density decay, and the rate constant of the first process was estimated to be equal to 5·10-8 cm3s-1.
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