Off-axis compressed holographic microscopy in low-light conditions

Details Off-axis compressed holographic microscopy in low-light conditions Off-axis compressed holographic microscopy in low-light conditions

2011-01-10

arxiv.org/abs/1101.1735v1

Optics Letters 36, 1 (2011) 79

Physics

Optics

Scientific paper

This Letter reports a demonstration of off-axis compressed holography in low-light level imaging conditions. An acquisition protocol relying on a single exposure of a randomly undersampled diffraction map of the optical field, recorded in the high heterodyne gain regime, is proposed. The image acquisition scheme is based on compressed sensing, a theory establishing that near-exact recovery of an unknown sparse signal is possible from a small number of nonstructured measurements. Image reconstruction is further enhanced by introducing an off-axis spatial support constraint to the image estimation algorithm. We report accurate experimental recovering of holographic images of a resolution target in low-light conditions with a frame exposure of 5 \mu s, scaling down measurements to 9% of random pixels within the array detector.

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