Fast rewritable computer generated hologram in photochromicmaterial

摘要

A high resolution light modulator which can be controlled in realtime is useful as a parallel optical computing device. Also holographyhas many excellent characteristics such as multi-recorded memory andassociative memory. For these purposes several kinds of opticalcalculating methods with interconnection are proposed. On the otherhand, a computer generated hologram (CGH) can display any kind ofinterconnection table and can vary the table easily by changing theinput pattern. The authors consider recording CGH in the photochromicmaterial. The photochromic material for optical memory, which can berecorded fast and repeatedly has been proposed by Lo (1974). First theystudy the characteristics of photochromic glass and consider thepossibility of this material for rewritable optical memory. Next theyconstitute the optical set up for recording CGH in it. Finally theyconsider the characteristics of CGH recorded in the photochromicmaterial