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Ultrabroadband Biphotons Generated via Chirped Quasi-Phase-Matched Optical Parametric Down-Conversion
Magued B. Nasr (Boston University), Silvia Carrasco (Boston University), Bahaa E. A. Saleh (Boston University), Alexander V. Sergienko (Boston University), Malvin Carl Teich (Boston University), Juan P. Torres (Institute of Photonic Sciences, Universitat Politècnica de Catalunya), Lluís Torner (Institute of Photonic Sciences, Universitat Politècnica de Catalunya), David S. Hum (Stanford University), M. M. Fejer (Stanford University)
Abstract: We generate ultrabroadband biphotons via the process of spontaneous parametric down-conversion (SPDC) in quasi-phase-matched nonlinear gratings that have a linearly chirped wave vector. By using these ultrabroadband biphotons (300-nm bandwidth), we measure the narrowest Hong-Ou-Mandel dip to date, having a full width at half maximum of 7.1 fs. This enables the generation of a high flux of nonoverlapping biphotons with ultrabroad bandwidth, thereby promoting the use of SPDC light in many nonclassical applications.