Aperture synthesis in digital holography

Resolution and speckle size in the reconstructed wavefields of digital holography depend on the aperture defined by the size of the CCD-array. Here we introduce the concept of synthesizing a, larger aperture by recording simultaneously the same scene by at least two CCD-arrays. It, is shown that an improvement in resolution can be obtained which corresponds to a virtual aperture of the size defined by the distance between the two CCDs. This is shown by a. comparison of the point spread functions of systems with one and with two apertures. Open problems are stated and future prospects are presented.