We study the tuning curve of entangled photons generated by type-0 spontaneous parametric down-conversion in a periodically poled potassium titanyl phosphate crystal. We demonstrate the X-shaped spatiotemporal structure of the spectrum by means of measurements and numerical simulations. Experiments for different pump waists, crystal temperatures, and crystal lengths are in good agreement with numerical simulations.
© 2013 Optical Society of America
Original Manuscript: November 20, 2012
Revised Manuscript: January 7, 2013
Manuscript Accepted: February 21, 2013
Published: March 14, 2013
Stefan Lerch, Bänz Bessire, Christof Bernhard, Thomas Feurer, and André Stefanov, "Tuning curve of type-0 spontaneous parametric down-conversion," J. Opt. Soc. Am. B 30, 953-958 (2013)