Stimulation of Nonradiative Decay Under Intensive Light Excitation
The light emission by impurity ions in crystals under Stokes excitation is preceded by a nonradiative transition which populates the radiative level. Information about the probability of non-radiative transition may be obtained by studying the emission rate after ultra-short exciting pulses of high intensity. The emission rate of CaF2 crystals activated by Sm2+ ions was investigated. Subnanosecond pulses of the second harmonic of a Nd-glass mode-locked laser were used for the excitation. The probabilities of nonradiative decay were determined. It was found that in CaF2:Sm2+ the non-radiative decay probability depends on the exciting light intensity. Results are interpreted in terms of the induced nonradiative transitions by “hot” phonons.
KeywordsNonradiative Transition Nonradiative Decay Excitation Density Excited Center Rapid Component
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