In his comment [Opt. Lett.45, 3510 (2020)OPLEDP10.1364/OL.385246], Charnotskii claims that the cross-spectral densities recently studied in Opt. Lett.45, 698 (2020)OPLEDP10.1364/OL.385246 of partially coherent beams atop a statistical background do not… Click to show full abstract
In his comment [Opt. Lett.45, 3510 (2020)OPLEDP10.1364/OL.385246], Charnotskii claims that the cross-spectral densities recently studied in Opt. Lett.45, 698 (2020)OPLEDP10.1364/OL.385246 of partially coherent beams atop a statistical background do not satisfy the non-negative definiteness requirement. We argue that Charnotskii's claim stems from his misunderstanding of the non-negative definiteness concept as applied to the model of Opt. Lett.45, 698 (2020)OPLEDP10.1364/OL.385246.
               
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