Physical Characterization of the Photorefractive Incoherent-to-Coherent Optical Converter

摘要

Volume holographic storage in photorefractive Bi12SiO20 (BSO) crystals is used to perform dynamic incoherent-to-coherent image conversion by means of selective spatial erasure of a uniform grating with white (or quasi-monochromatic) light. Physical characterization of device performance is described, with emphasis on resolution, sensitivity, and temporal response. The photorefractive incoherent-to-coherent optical conversion process is analyzed in terms of a simple model that relates the diffracted intensity to the space-variant effective modulation ratio.