We introduce a new class of partially coherent sources of Schell type with cosine-Gaussian spectral degree of coherence and confirm that such sources are physically genuine. Further, we derive the expression for the cross-spectral density function of a beam generated by the novel source propagating in free space and analyze the evolution of the spectral density and the spectral degree of coherence. It is shown that at sufficiently large distances from the source the degree of coherence of the propagating beam assumes Gaussian shape while the spectral density takes on the dark-hollow profile.
© 2013 Optical Society of America
Coherence and Statistical Optics
Original Manuscript: May 6, 2013
Revised Manuscript: June 17, 2013
Manuscript Accepted: June 18, 2013
Published: July 12, 2013
Zhangrong Mei and Olga Korotkova, "Cosine-Gaussian Schell-model sources," Opt. Lett. 38, 2578-2580 (2013)