全国首届全息摄影技术展览于1984年9月29日在北京开幕。我院激光研究室用相干长度为40厘米的普通多纵模氦氖激光器拍摄出两幅大景深全息图参加展出。科学院副院长、中国光学会名誉理事长王大珩教授在观看激光全息三维显示的展品部分时说:“用相干长度为40厘米的激光器拍了这样大的景深,不容易。” The first national holographic technology exhibition was opened in Beijing on September 29, 1984. In our laser lab, two large depth-of-field holograms with a coherent length of 40 cm were photographed to exhibit. Professor Wang Daxuan, vice president of the Academy of Sciences and honorary chairman of the China Optics Association, said while watching the part of the exhibits of laser holographic three-dimensional display: “It is not easy to shoot such a large depth of field with a laser with a coherent length of 40 cm.”