Exothermal spectral diffusion in media with large diagonal disorder of 4f-states: the role of phenomenology models in cooperative and coherent optical phenomena

V. G. Davydov; V. V. Ovsyankin; A. A. Fedorov

doi:10.1117/12.229146

3 January 1996 Exothermal spectral diffusion in media with large diagonal disorder of 4f-states: the role of phenomenology models in cooperative and coherent optical phenomena

V. G. Davydov, V. V. Ovsyankin, A. A. Fedorov

Author Affiliations +

Proceedings Volume 2706, Tenth Feofilov Symposium on Spectroscopy of Crystals Activated by Rare-Earth and Transitional-Metal Ions; (1996) https://doi.org/10.1117/12.229146
Event: Tenth Feofilov Symposium on Spectroscopy of Crystals Activated by Rare Earth and Transitional Ions, 1995, St. Petersburg, Russian Federation

Abstract

In an ensemble of rare earth ions (REI) with large energy disorder, interaction of the ions between themselves and with vibrations of the media gives rise to spectral diffusion, ie., to energy redistribution within the subsystem of the ensemble's excited states. It usually occurs at concentrations >= 10¹⁹ cm^-3. At low temperatures kT << W (W is the disorder scale), the process turns into energetically unidirectional exothermal spectral diffusion (ExoTSD). Below we consider general regulations of the ExoTSD, its effect on formation of cooperative, coherent, and critical photoresponse of the system. Special attention is paid to the role of collective 4f-states in media with high REI concentration.

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V. G. Davydov, V. V. Ovsyankin, and A. A. Fedorov "Exothermal spectral diffusion in media with large diagonal disorder of 4f-states: the role of phenomenology models in cooperative and coherent optical phenomena", Proc. SPIE 2706, Tenth Feofilov Symposium on Spectroscopy of Crystals Activated by Rare-Earth and Transitional-Metal Ions, (3 January 1996); https://doi.org/10.1117/12.229146

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