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A new multiple index technique is presented for holographically generating contours of constant depth. With this technique it is possible for the first time to use the multiple index method for obtaining high contrast contours denoting small depth changes over large surfaces. The improved multiple index technique is compared with an analogous multiple frequency system. Experimental results obtained with both of these techniques are also presented.

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Employing holographic techniques, Hildebrand and Haines have demonstrated that a multiple frequency source can be used to generate range contours on or near an image. Supplementing their system with an auxiliary imaging system, we show that contours can be generated over much larger surfaces. With our modified system, it is also very easy to generate contours denoting constant depth rather than constant range. Experimental results are presented that show depth contours representing separations of 9.25 micro over a surface area of about 80 cm(2).