Proceedings PaperLaser light scattering by nonergodic gel systems
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Light scattered from all gel systems is non-ergodic, i.e., only partial spectral broadening occurs and the scattered speckle pattern has a stationary component. Autocorrelation functions in general have both homodyne and heterodyne components, but recent theoretical work has cast doubt on the interpretation of such data when the coherence factor of the optical system, (beta) , is other than unity. An empirical investigation has therefore been made using a well defined system, in which the degree of spectral broadening is already known. It has been shown that the method previously described in which the correlator is run while scanning angles of scatter, is valid irrespective of the value of (beta) . The extent to which (beta) influences the interpretation of the results in any one arbitrary position is discussed.