Transverse coherence length of down-converted light in the two-photon state
E. J. S. Fonseca, Carlos Henrique Monken, Sebastião Pádua, Glívia Angélica Rodrigues Barbosa · Physical Review A · 1999
Measurements of the Young interference pattern for down-converted light in the two-photon state are performed. Light in the two-photon state is generated at the output of a Hong-Ou-Mandel balanced interferometer. Two-photon interference patterns with visibilities up to 100% are obtained. Visibilities of the two-photon interference patterns as a function of the double-slit separation are obtained and show that the transverse coherence length of the two-photon light is much larger than the one-photon beam for the distances considered in the experiment.