Local photorefractive materials based on DX centers

Summary form only given. While optical data storage is one potential application of this effect, this requires very long persistence times and we continue to search for materials exhibiting persistent photoconductivity (PPC) with a larger capture barrier, which would allow for persistent features at or near room temperature. We have, however also demonstrated that some applications of this effect do not require long persistence times. In particular, we have demonstrated phase conjugation using low-power diode lasers. In this application, a short persistence time is required so that operation closer to room temperature is possible. These results are summarized.