Wave-optics simulation of dynamic speckle: I. In a pupil plane

Burrell, Derek; Spencer, Mark F.; Zandt, Noah R. Van; Driggers, Ronald G.

doi:10.1364/ao.427963

Cited by 13 publications

(8 citation statements)

References 37 publications

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“…The first mechanism is well-known and is described in detail for a variety of types of object motion by Burrell et al 10,11 Stationary objects will provide a common speckle pattern across all of the 2D images in U i (u, v; ν n ) such that the linear phase terms that depend on Z d (u, v) are preserved. In contrast, if object motion is severe enough to provide independent speckle patterns for each U i (u, v; ν n ), then a 3D image is impossible to generate.…”

Section: Speckle Decorrelation Mechanismsmentioning

confidence: 99%

Effects of speckle decorrelation on motion-compensated, multi-wavelength, 3D digital holography

Banet

Fienup²

2022

Unconventional Imaging and Adaptive Optics 2022

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Digital holography enables 3D imagery after processing frequency-diverse stacks of 2D coherent images obtained from a chirped-frequency illuminator. To compensate for object motion or vibration, a constant temporal frequency or "pilot tone" illuminator can act as a reference for each chirped frequency. This paper examines speckle decorrelation between the chirped and pilot tone illuminators and its effect on the resultant range images. We show that speckle decorrelation between the two illuminators is more severe for facets of the object's surface that are more highly sloped, relative to the optical axis, and that this decorrelation results in noise in the range images in the areas of the object that are highly sloped. We examine the severity of this noise as a function of several imaging parameters and show that post-processing apodization, effectively reducing bandwidth, in the temporal frequency domain can reduce this noise.

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Section: Speckle Decorrelation Mechanismsmentioning

confidence: 99%

Effects of speckle decorrelation on motion-compensated, multi-wavelength, 3D digital holography

Banet

Fienup²

2022

Unconventional Imaging and Adaptive Optics 2022

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“…The first mechanism is well-known 5 and is described in detail for a variety of types of object motion by Burrell et al 16 , 17 . Stationary objects will provide a common speckle pattern across all of the 2D images in Ui(u,v;νn) such that the linear phase terms that depend on Zd(u,v) are preserved.…”

Section: Theorymentioning

confidence: 99%

Speckle decorrelation effects on motion-compensated, multi-wavelength 3D digital holography: theory and simulations

Banet

Fienup

2023

Opt. Eng.

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.Digital holography enables 3D imagery after processing frequency-diverse stacks of 2D coherent images obtained from a chirped-frequency illuminator. To compensate for object motion or vibration, which is a common occurrence for long-range imaging, a constant temporal frequency or “pilot-tone” illuminator can act as a reference for each chirped frequency. We examine speckle decorrelation between the chirped and pilot-tone illuminators and its effect on the resultant range images. We show that speckle decorrelation between the two illuminators is more severe for facets of the object’s surface that are more highly sloped, relative to the optical axis, and that this decorrelation results in noise in the range images in the areas of the object that are highly sloped. We develop a theoretical framework along with wave-optics simulations for 3D imaging with a pilot tone, and we examine the severity of this noise as a function of several imaging parameters, including the illumination bandwidth, pulse frequency spacing, and atmospheric turbulence strength; we show that 3D sharpness metric maximization can mitigate some of the noise induced by turbulence, all in a simulated framework.

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“…At optical wavelengths, this decorrelation occurs with rotations of only a few microradians. 9,17,18 When this is true, G is distributed according to…”

Section: Multi-shot Data Modelmentioning

confidence: 99%

Experimental validation of model-based digital holographic imaging using multi-shot data

Bate

O’Keefe

Spencer³

et al. 2022

Unconventional Imaging and Adaptive Optics 2022

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Imaging through deep turbulence is a hard and unsolved problem. There have been recent advances toward sensing and correcting moderate turbulence using digital holography (DH). With DH, we use optical heterodyne detection to sense the amplitude and phase of the light reflected from an object. This phase information allows us to digitally back propagate the measured field to estimate and correct distributed-volume aberrations. Recently, we developed a model-based iterative reconstruction (MBIR) algorithm for sensing and correcting atmospheric turbulence using multi-shot DH data (i.e., multiple holographic measurements). Using simulation, we showed the ability to correct deep-turbulence effects, loosely characterized by Rytov numbers greater than 0.75 and isoplanatic angles near the diffraction limited viewing angle. In this work, we demonstrate the validity of our method using laboratory measurements. Our experiments utilized a combination of multiple calibrated Kolmogorov phase screens along the propagation path to emulate distributed-volume turbulence. This controlled laboratory setup allowed us to demonstrate our algorithm’s performance in deep turbulence conditions using real data.

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Wave-optics simulation of dynamic speckle: I. In a pupil plane

Cited by 13 publications

References 37 publications

Effects of speckle decorrelation on motion-compensated, multi-wavelength, 3D digital holography

Effects of speckle decorrelation on motion-compensated, multi-wavelength, 3D digital holography

Speckle decorrelation effects on motion-compensated, multi-wavelength 3D digital holography: theory and simulations

Experimental validation of model-based digital holographic imaging using multi-shot data

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