Currently, different techniques are known for synthesizing in a tunable fashion the frequency correlations of paired photons generated in spontaneous parametric downconversion (signal-idler correlations). We show that these same techniques can also be used to tune the first-order coherence properties of the signal or idler photons (signal–signal or idler–idler frequency correlations). In consequence, partially coherent radiation can be synthesized through adequate biphoton engineering. Interestingly, when the biphoton is designed to be in a separable state, the signal photons behave as a broadband first-order coherent light source.
© 2009 Optical Society of America
Coherence and Statistical Optics
Original Manuscript: December 23, 2008
Manuscript Accepted: February 25, 2009
Published: April 7, 2009
Víctor Torres-Company, Alejandra Valencia, and Juan P. Torres, "Tailoring the spectral coherence of heralded single photons," Opt. Lett. 34, 1177-1179 (2009)