Recently a new class of photorefractive structures has been demonstrated. These devices rely on the spatial separation of photogenerated electrons and holes to produce a large refractive index modulation via the electro-optic effect and might have potential for all optical switching applications. One of these devices consists of an asymmetric 6-doped superlattice which is optically excited by a picosecond laser source. The resulting space charge field produced by charge separation creates a refractive index change of 3.8xl0-4 at a pump energy density of 40 fJum2. In this paper we report the first time-resolved studies of the carrier relaxation in these structures. The measurements were performed by a Time Correlated Photon Counting TCPC technique.
This article is from 'Organization of the Optical Society of America Photonic Science Topical Meeting Series. Volume 7. Quantum Optoelectronics Held in Salt Lake City, Utah on 11-13 March 1991,' AD-A253 823, p247-250.