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Digital Holography at Shot Noise Level

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Fig. 1. Digital holography setup. AOM1 and AOM2 : acousto-optic modulators; BS : beam splitter; BE : beam expander; M : mirror; A1 and A2 : attenuator; θ : tilt angle of the beam splitter with respect to optical axis
Fig. 2. 1 photon equivalent signal (accounting Heterodyne gain), and shot noise on the holographic Local Oscillator beam.
Fig. 3. Frequency response |η(x)| 2 for heterodyne signal in intensity, as a function of the heterodyne beat frequency x = f − f LO for sequences of 4n frames with 4n = 4 (heavy grey line), 4n = 8 (solid black line), and 4n = 16 (dashed black line)
Fig. 4. Frequency response for heterodyne signal in intensity, as a function of the heterodyne beat frequency x = f − f LO for a sequence of 4 frames:
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