Photorefractive properties of Bi4Ti3O12
Abstract
Three gratings are observed during holographic recording in Bi4Ti3O12: There is a primary photoinduced grating with fast response and a dephasing of π/2 with respect to the light pattern. It is compensated for by a complementary charge grating with much slower response. The third grating identified by phase-shift experiments is an absorption grating. At an intensity of about 0.5 W/cm2, a peak refractive-index change of Δn=1.8×10-5 is achieved with a response time constant τ1=40 ms. The mobility-lifetime product of the charges responsible for the primary grating is μτR1=7.0×10-12 cm2/V. The conductivity of the complementary charges is much smaller than that of the primary charges, which makes it possible to prolong the readout time of the recorded holographic grating considerably.
- Publication:
-
Physical Review B
- Pub Date:
- April 1997
- DOI:
- 10.1103/PhysRevB.55.9495
- Bibcode:
- 1997PhRvB..55.9495Y