Photorefractive properties of reduced BaTiO3:Rh at wavelengths of 514 nm and 633 nm

摘要

Abstract: We report that two beam coupling and response time of reduced BaTiO$-3$/:Rh at wavelengths of 514 nm and 633 nm. For the as-grown, the carriers are holes for both of wavelengths of 514 nm and 633 nm. When reduced at the atmosphere of 10$+$MIN@10$/ atm oxygen partial pressure, the carrier is electron for wavelength of 514 nm, and hole for 633 nm. With higher reduction, the carriers are electrons for both of wavelengths. Two beam coupling gain is also dependent on the reduction level and incident wavelength. For the as-grown, the trap density is 23 by 10$+16$/ cm$+$MIN@3$/ for 514 nm and 15 by 10$+16$/ cm$+$MIN@3$/ for 633 nm. For the sample reduced at the atmosphere of 10$+$MIN@10$/ atm oxygen partial pressure, the trap density decreases and is 5 by 10$+16$/ cm$+$MIN@3$/ for 514 nm and 2 by 10$+16$/ cm$+$MIN@3$/ for 633 nm. With higher reduction, the trap density increases and is 12 by 10$+16$/ cm$+$MIN@3$/ for 514 nm and 5 by 10$+16$/ cm$+$MIN@3$/ for 633 nm. !9