The theoretical principles of noricorrelated and correlated ( identical ) speckle fields interference with due account of spatial photoreceiver resolution is considered . The physical analogies between identical speckle fields interference arid that of partially coherent radiation of extended thermal light sources are followed.
INTRODUCrIONSpeckle modulated light waves -coherent waves with a randot amplitude-phase structure are produced at when laser light is scattered by an inhornogeneous objects or rough surface". Laser radiation, passing through iultimode optical fibers or fiber bundles, also acquires speckle modulation. Coherent fields with a speckle structure, that are often called speckle fields, are inforiatiori carriers in holography3, laser measurements4 ' , optical systems of images format ion and information processing"3. Wide distribution of speckle fields in modern coherent optics and their peculiarities set the fields off into a separate independent class of coherent light fields whose properties have been investigated in the last two decades.In practice there exist various forms of speckle fields interference . Three typical cases can be arbitrary singled out: interference of a speckle field arid a wave with a smooth front, that of rionidentical (rioricorrelated) speckle fields, formed by different scatterers, and, lastly, interference of identical speckle fields that are the copies of the same realization of the initial speckle field. It is siifioant that in every of the above mentioned instances of speckle fields interference the result observed tangibly depends on the relationship between spatial frequencies of amplitude phase nicxiulation of initial speckle fields and the formed interference pattern. in this case the spatial resolution of a photoreceiver and corresponding spatial averaging play the same basic part in speckle fields interference as a photoreceiver tiie resolution and time averaging in partially coherent light interference6. At the same time a close investigation of the speckle fields interference nature allows to detect a number of interesting and cognitive physical analogies with interference of partially coherent light from extended thermal light sources.Fringe formation at speckle fields interference was the subject matter of several papers (See, for example, Ref .4,5) in which the point was considered with due account of the particular techniMues features of holographic interfercimetry, pocklc photography and speckle interferometry. In this paper, our main concern is with the general theoretical and empirical principles of speckle fields interference consideririg, for instance, traditional optical interferometers schemes. The observance conditions of interference fringes, their visibility and the localization region position with due account spatial resolving photoreceiver ability are considered. 0-8194-1673-8/94/$6.00 SP!E Vol. 2340 / 513 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 05/19/2015 Terms of Use: http://spiedl.org/terms
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