The effect on the Stokes parameters of a Gaussian Schell model beam on propagation in free
space is studied experimentally and results are matched with the theory [X. H. Zhao, et al.
Opt. Express 17, 17888 (2009)] that in general the degree of polarization of a
Gaussian Schell model beam doesn’t change on propagation if the three spectral
correlation widths , , are equal and the beam width parameters . It is experimentally shown that all the four Stokes parameters
at the center of the beam decrease on propagation while the magnitudes of the normalized Stokes
parameters and the spectral degree of polarization at the center of the beam remain constant
for different propagation distances.
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