Measuring small displacements of an optical point source with digital holography

PLUTO / PLUTO-2 Spatial Light Modulators
Digital-/ Computer Holography/ CGH Imaging/ Image Processing
Published on:
Authors: Zhou, Chaohui; Xin, Jun; Li, Yanan; Lu, Xiao-Ming
Abstract:

The image of an optical point source is blurred due to light diffraction so that estimating small displacements of the point source with direct imaging demands elaborate processing on the observation data of a camera. Using quantum parameter estimation, we show that for the imaging systems with a real point spread function, any measurement basis constituted by a complete set of real-valued spatial-mode functions is optimal for estimating the displacement. For small displacements, we can concentrate the information about the value of displacement to the measurement of a few spatial modes, which can be selected in terms of the Fisher information distribution. We use digital holography with a phase-only spatial light modulator to implement two simple estimation strategies that are mainly based on the projection measurement of two spatial modes and the readout of a single pixel of a camera.

Open Access

Publication: Optics Express
Issue/Year: Vol. 31, Issue 12, pp. 19336-19346 (2023)
DOI: 10.1364/OE.486539
Link: https://doi.org/10.1364/OE.486539

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