Coherent imaging of a pure phase object with classical incoherent light

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M. Bache, D. Magatti, F. Ferri, A. Gatti, E. Brambilla, and L. A. Lugiato
CNR-INFM-CNISM, Dipartimento di Fisica e Matematica, Università dell'Insubria, Via Valleggio 11, 22100 Como, Italy

Received 21 December 2005; published 3 May 2006

Byusing the ghost imaging technique, we experimentally demonstrate the reconstructionof the diffraction pattern of a pure phase object byusing the classical correlation of incoherent thermal light split ona beam splitter. The results once again underline that entanglementis not a necessary feature of ghost imaging. The lightwe use is spatially highly incoherent with respect to theobject ( [approximate] 2 µm speckle size) and is produced by a pseudo-thermalsource relying on the principle of near-field scattering. We showthat in these conditions no information on the phase objectcan be retrieved by only measuring the light that passedthrough it, neither in a direct measurement nor in aHanbury Brown-Twiss (HBT) scheme. In general, we show a remarkablecomplementarity between ghost imaging and the HBT scheme when dealingwith a phase object.

URL:	http://link.aps.org/doi/10.1103/PhysRevA.73.053802
DOI:	10.1103/PhysRevA.73.053802
PACS:	42.50.Dv; 42.50.Ar; 42.30.Va 42.50.Dv Nonclassical states of the electromagnetic field, including entangled photon states; quantum state engineering and measurements 42.50.Ar Photon statistics and coherence theory 42.30.Va Image forming and processing YEAR: 2006
KEYWORDS:	quantum optics, quantum entanglement, optical images, optical beam splitters, light diffraction, light scattering, pattern formation, optical correlation, image reconstruction

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