Charge shielding effects of photoexcited mobile carriers on occupied deep trapping centers in BSO.
Evidence is presented to support the theory that photoexcited charge carriers screen the field due to the trapped charges that form the phase grating in photorefractive materials. The diffraction intensity due to the grating and the decay time constants of the trapped charges are influenced by this screening. Electricfield modulation of these effects is also present. The effects have been measured and compared to the expected generation rates of free and trapped charges.
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Attard