We have demonstrated that the intermodulation light, normally found in off-axis holograms of real (diffuse) objects, can be suppressed to any desired degree by a scanned illumination recording technique. This is accomplished by illuminating the object only over a very small region (spot) at a given time. An improvement in speed and reconstruction efficiency over the spot-scan recording is obtained by a line-scan technique. For three-dimensional objects, an additional problem arises due to the finite aperture of the hologram, and a double-scan technique is described to obviate this difficulty. Experimental results are presented for all three methods.
D. J. DeBitetto and A. L. Dalisa, "Elimination of Flare Light in Hologram Recording of Diffuse Objects," Appl. Opt. 10, 2292-2296 (1971)