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• W1989732522 endingPage "6245" @default.
• W1989732522 startingPage "6227" @default.
• W1989732522 abstract "Four-wave-mixing techniques were used to establish and probe population gratings of ${mathrm{Cr}}^{3+}$ ions in alexandrite crystals at temperatures between 10 and 300 K. The results were interpreted in terms of the interaction of the laser radiation with a two-level atomic system. They provide information about the characteristics of four-wave-mixing signals for this physical situation as well as being useful in characterizing the properties of energy transfer and dephasing within the ensemble of ${mathrm{Cr}}^{3+}$ ions. The patterns of the transient four-wave-mixing signals are consistent with a model based on the pumping dynamics of ions in the mirror and inversion crystal-field sites. The variation of the signal intensity with laser power is strongly affected by beam depletion. The characteristics of exciton migration among ${mathrm{Cr}}^{3+}$ ions in mirror sites were determined from the results of measuring the variation of the signal decay rate with grating spacing. The temperature dependences of the ion-ion interaction rate, the exciton-phonon scattering rate, and the diffusion coefficient were determined. These are found to be essentially the same for pumping into the $^{4}mathrm{T}_{2}$ and $^{2}mathrm{E}$ levels, but the effects of scattering from a grating of ions in inversion sites is much stronger for $^{4}mathrm{T}_{2}$ pumping. The dephasing times for the atomic system were found from analyzing the variation of the signal intensity with grating spacing. For pumping into the $^{4}mathrm{T}_{2}$ level the dephasing is dominated by radiationless decay processes. A model is presented for the decay channel that provides a theoretical explanation for the decay process which is consistent with the measured temperature and frequency dependences of the results as well as their variation with crystal-field strength. For pumping into the $^{2}mathrm{E}$ level the dephasing is dominated by dephasing processes associated with the inhomogeneous linewidth of the transition." @default.
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• W1989732522 date "1988-09-15" @default.
• W1989732522 modified "2023-09-27" @default.
• W1989732522 title "Laser-induced grating spectroscopy of alexandrite crystals" @default.
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• W1989732522 doi "https://doi.org/10.1103/physrevb.38.6227" @default.
• W1989732522 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/9947085" @default.
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