Ghost imaging using homodyne detection

Journal Article · Sun Aug 01 04:00:00 EDT 2004 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.70.023823· OSTI ID:20645963

Bache, M; Brambilla, E; Gatti, A; Lugiato, L A ^[1]

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1. INFM, Dipartimento di Fisica e Matematica, Universita dell'Insubria, Via Valleggio 11, 22100 Como (Italy)

We present a theoretical study of ghost imaging based on correlated beams arising from parametric down-conversion, and which uses balanced homodyne detection to measure both the signal and idler fields. We analytically show that the signal-idler correlations contain the full amplitude and phase information about an object located in the signal path, both in the near-field and the far-field case. To this end we discuss how to optimize the optical setups in the two imaging paths, including the crucial point regarding how to engineer the phase of the idler local oscillator as to observe the desired orthogonal quadrature components of the image. As is well known, the near-field image resolution is inherently linked to the far-field bandwidth of the image, determined by the bandwidth of the source of the correlated beams. We show how to circumvent this limitation by using a spatial averaging technique which dramatically improves the imaging bandwidth of the far-field correlations as well as speeds up the convergence rate. The results are backed up by numerical simulations taking into account the finite size and duration of the pump pulse.

• OSTI ID: 20645963
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 2 Vol. 70; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
AMPLITUDES
COMPUTERIZED SIMULATION
CONVERGENCE
CONVERSION
CORRELATIONS
DETECTION
IMAGES
OPTICS
OSCILLATORS
PULSES
QUADRATURES
QUANTUM MECHANICS
RESOLUTION
SIGNALS
VELOCITY