EXPOSURE-INDUCED HIGH-PASS FILTERING OF A VOLUME BY MEANS OF AN ABSORPTION HOLOGRAM RECORDING TECHNIQUE

High-pass filtering effects have long been noted during recording of F ourier-type holograms on a saturable medium [Collier et al., Optical H olography (Academic, New York, 1971), p. 405]. The origin of the filte ring effect lies in recording an absorption hologram such that the dif fraction efficiency of strong spatial frequencies is significantly red uced by the saturable nature of the film. A simple optical configurati on is used to take advantage of this effect in order to reduce the dep th-of-focus noise associated with particle holography. The origin of t he noise is clutter produced by a field of out-of-focus particles in w hich the particle under scrutiny exists [Reynolds et al., The New Phys ical Optics Notebook: Tutorials in Fourier Optics (Society of Photo-Op tical Instrumentation Engineers, Bellingham, Washington, 1989), p. 205 ]. A theoretical basis for the filtering is presented. Experimental re sults are shown.