一、概述随着科学技术的发展,在海洋开发,水下施工方面对水下显示系统的需要日益迫切。现有的水下观察手段如水下摄影。水下电视虽能解决一些近距离水下观察的问题。但性能远不能满足实际需要。水下较远距离的观察更未见成功的报导。水下声纳虽有较远的作用距离,但不能直接成象。新近发展的声全息技术有些潜力,但目前亦有其内在困难如分辨率与观察距离有矛盾,即使在近距离上也还不能与水下电视的图象质量相比拟。自激光出现后,人们开始考虑利用激光于水下显示的可能性,国内外不少单位对此做过大量探索研究工作。由于光在水中衰减严重,直接影响光能的传输,更为严重的是水中悬浮 I. Overview With the development of science and technology, the need for underwater display systems in marine development and underwater construction is increasingly urgent. The existing means of underwater observation such as underwater photography. Although underwater television can solve some of the problems of close underwater observation. But the performance can not meet the actual needs. The more distant underwater observations have not seen successful coverage. Underwater sonar although far from the role of distance, but can not be directly imaged. The recent development of acoustic holography has some potential, but at the moment there are inherent difficulties such as resolution and observation distance contradictory to the underwater television’s image quality even at short distances. Since the advent of lasers, people began to consider the possibility of using laser light to show underwater. Many units at home and abroad have done a lot of exploration and research. Due to the serious attenuation of light in the water, a direct impact on the transmission of light energy, the more serious is the water suspension