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Spreading properties of beams radiated by partially coherent Schell-model sources

M. Santarsiero, F. Gori, R. Borghi, G. Cincotti, and P. Vahimaa

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Abstract

We derive a general law for the M2 factor of any beam generated by a partially coherent Schell-model source. The fourth power of M differs from its minimum value, attained in the coherent limit, by a term proportional to the second derivative of the modulus of the spectral degree of coherence evaluated for zero argument. Examples are given for cases of practical interest.

© 1999 Optical Society of America

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