Holograms of diffuse opaque objects which are submerged in water are difficult to obtain using a cw laser if the object is to be viewed from the top of the container. Experiments and theory are described which indicate that the major cause of the problem is excitation of unstable surface waves. When the object and container are on a stabilized table suitable for normal holography, these waves are excited by small residual oscillations of the table. Surface wave amplitudes can be of sufficient height and frequency to ruin the hologram. A simple solution to this problem is presented.
展开▼
