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Irradiating a GaAs0.60P0.40laser with radiation from a GaAs laser demonstrates conclusively that the delay-inducing traps are deep centers which act as saturable absorbers. These centers can be filled optically and then remain in the nonabsorbing state for milliseconds. Their concentration is greater than1 × 10¹⁷cm-3.
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J. I. Pánkové (1968) studied this question.
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