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Optica Publishing Group
  • International Quantum Electronics Conference
  • OSA Technical Digest (Optica Publishing Group, 1998),
  • paper QWG4

Spatial coherence of light in the two-photon state

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Abstract

In this paper we present experimental results of the Young’s double-slit interference pattern of light in the two-photon state. By doing Young’s interference experiments with the output light of a Hong-Ou-Mandel (H-O-M) interferometer, we are able to study the spatial coherence properties of the light in the two-photon state (two photons in the same wave packet). A LiIO3 crystal pumped by a Krypton laser emitting at λ = 413.1 nm was used to generate type I downconversion parametric luminescence. The downconverted beams were then combined in a 50/50% beam splitter BS1 for the generation of light in the two- photon state.1 Young double-slits (S2) of different separations are then placed in one of the exit paths of the interferometer (Fig. 1). The slits are aligned along the plane defined by the pump laser and the downconverted beams. The two-photon interference pattern is recorded by displacing a “two-photon detector” that consists of a single slit (SI) oriented parallel to the double slits, a 50/50% beam splitter BS2, and two avalanche photodiodes (D3, D4) detecting the photons in coincidence. Fourth-order interference patterns are obtained from the coincidence counts between D3 and D4 as a function of the two-photon detector transverse position, while second-order patterns are obtained from the single counts. Both patterns were fit to the function.

© 1998 Optical Society of America

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