本文利用激光的时间相干性对光程差的准周期性特点,采用光程差为腔长的偶数倍的物光照明以获得大景深全息图的拍摄,用普通的一米腔长的He-Ne激光器成功地拍摄了面积5m~2,景深8.2m的全息图,为全息技术在使用普通市售激光器情况下应用于工程技术拍摄大型结构开辟了很好的远景。

This paper discusses a method for making a holograms of great depth by using. multi-beam objective waves with path differences of even multiples of cavity length. A commercial He-Ne laser with cavity length of one meter was used to produce a hologram of 8.2 m depth and 5m2 area. This method may open a promising prospect for holographic recording of large engineering structures with commerical lasers.