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The photoconductivity and holographic current have been studied in Er-, Tm-, and Ho-doped laser crystals under visible and infrared excitation. Kinetics and spectroscopic studies have shown that photoconductivity is linearly proportional to the concentration of excited states. The holographic current was described with a model accounting for the energy transfer between the rare-earth and ligand electronic shells, ionization, recombination, and the diffusion and drift currents in the conduction band. The dependence of the holographic current on the modulation frequency, grating vector, etc. were used to determine the carriers’ diffusion length and the screening length in Er-doped crystals.
© 1997 Optical Society of America
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