In this letter we show that the "spreading" effect due to the use of an extended source in the recording of a hologram does not result in an irretrievable resolution loss, but that the "loss" may be compensated and the resolution retrieved by illuminating the hologram, in the reconstruction, by the same source as that used in the recording (or by another suitable source), provided that the auto-correlation function of the function describing the "extended" source (or the crosscorrelation of the source functions) has itself a narrow central-peak width, of the order of the desired *resolution. This is the case for suitably "structured" sources with a broad spatial-frequency representation, for example. We have verified the principle by using an arbitrarily selected "structured" source ( fig. 1) in place of the usual point sources (recording and reconstruction) in a Fourier-transform holography arrangement [1][2][3][4]. With the use of (a) "lensless" Fourier-transform holography arrangements [2, 3] (having recordability gains, with spherical plates, exceeding 103 compared to Fresneltransform holography), and (b) "structured source" holography arrangements, the two major limitations which appeared to stand in the way of extensions of high-resolution holography to the X-ray domain now appear to have been largely cleared away.Our method may at first sight appear to have some similarity with the arrangement independently considered by Denisyuk [5 ], who suggests using essentially "the same source" in the reconstruction, is in the recording. However,
Two methods for holographic cinematography are described and analyzed: the scatter-plate and the lens methods. The advantages, capabilities, and limitations of each are given.
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