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Thesurfaceroughnessdependenceoftheopticalfieldatuocorrelationfunctionandtheintensityautocorrelationfunctionofthespecklepattern ,producedinthefarfieldundertheilluminationofaGaussianbeam ,hasbeentheoreticallyinvestigatedwiththeassumptionthattheirregularitiesofthetargetsurfacesarelargerthanthelaserwavelength.Analyticalexpressionsforthefirst andsecond ordermomentsoftheintensityhavebeenderived,andthesizeofthespecklecellhasbeencomputed.Theanalysisindicatesthatthemeanintensityofthespecklepatternsiscloselyrelatedtotheratioofthelateralcorrelationlengthtothesurfaceroot mean squareheightofthesurface.Whereasthesizeofthespecklecellandthecorrelationdegreeofthespeckleintensitiesareshowntobeindependentoftheparameterscharacterizingtheroughnessofasurface,andonlydeterminedbythela serbeamwaist.







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