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Wavefront sensing with a thin diffuser
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DOI：10.1364/OL.42.005117.png)
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Abstract
En 中文
We propose and implement a broadband, compact, and low-cost wavefront sensing scheme by simply placing a thin diffuser in the close vicinity of a camera. The local wavefront gradient is determined from the local translation of the speckle pattern. The translation vector map is computed thanks to a fast diffeomorphic image registration algorithm and integrated to reconstruct the wavefront profile. The simple translation of speckle grains under local wavefront tip/tilt is ensured by the so-called memory effect of the diffuser. Quantitative wavefront measurements are experimentally demonstrated, both for the few first Zernike polynomials and for phase-imaging applications requiring high resolution. We finally provided a theoretical description of the resolution limit that is supported experimentally. (c) 2017 Optical Society of America
Keywords:
SPECKLE SCANNING MICROSCOPY
PHASE-CONTRAST
DIGITAL HOLOGRAPHY
DISORDERED MEDIA
FIBER BUNDLE
FIELD
INTERFEROMETRY
RECONSTRUCTION
REGISTRATION
SENSOR
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