Deep-turbulence wavefront sensing using digital holography in the on-axis phase shifting recording geometry with comparisons to the self-referencing interferometer

Thornton, Douglas E.; Spencer, Mark F.; Perram, Glen P.

doi:10.1364/ao.58.00a179

Cited by 36 publications

(14 citation statements)

References 26 publications

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“…The exact method by which one generates the digital holograms can vary, but the process allows for the generation of complex-valued field data in an image plane via Fourier processing techniques on the hologram data. [6][7][8] In the case of 3D digital holography, one obtains a stack of 2D coherent images of the object with different illumination frequencies. We describe the 3D image formation process as follows: In general, we have some 3D object denoted by an amplitude reflectance function, U o (ξ, η; z), where (ξ, η) are the transverse coordinates in the object plane and z is the range coordinate.…”

Section: Conventional Multi-wavelength 3d Imagingmentioning

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: Conventional Multi-wavelength 3d Imagingmentioning

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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“…Recent results show that digital holography (DH) is an enabling technology for tactical applications, such as deep-turbulence wavefront sensing [1][2][3] and long-range imaging. [4][5][6] By flood illuminating a distant object and interfering the scattered signal with a local reference, we can reconstruct the amplitude and phase of the complex-optical field.…”

Section: Introductionmentioning

confidence: 99%

Digital holography experiments with degraded temporal coherence

Thornton¹,

Mao²,

Spencer

et al. 2020

Opt. Eng.

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To simulate the effects of multiple-longitudinal modes and rapid fluctuations in center frequency, we use sinusoidal phase modulation and linewidth broadening, respectively. These effects allow us to degrade the temporal coherence of our master-oscillator laser, which we then use to conduct digital holography experiments. In turn, our results show that the coherence efficiency decreases quadratically with fringe visibility and that our measurements agree with our models to within 1.8% for sinusoidal phase modulation and 6.9% for linewidth broadening.

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“…or applications like long-range imaging, digitalholographic systems interfere a scattered signal with a strong reference to create a spatially modulated pattern known as a hologram [1]. This hologram is recorded digitally and processed computationally to estimate the complex-optical field, which in terms of the amplitude and wrapped phase contains information about the aberrations that exist along the propagation path [2]- [4]. In turn, digital holography robustly enables applications like long-range imaging [5]- [10].…”

Section: Introductionmentioning

confidence: 99%

Spectral Broadening Effects on Pulsed-Source Digital Holography

Owens

Spencer

Perram

2023

IEEE J. Quantum Electron.

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Using a pulsed configuration, a digital-holographic system is setup in the off-axis image plane recording geometry, and spectral broadening via pseudo-random bit sequence is used to degrade the temporal coherence of the master-oscillator laser. The associated effects on the signal-to-noise ratio are then measured in terms of the ambiguity and coherence efficiencies. It is found that the ambiguity efficiency, which is a function of signal-reference pulse overlap, is not affected by the effects of spectral broadening. The coherence efficiency, on the other hand, is affected. As a result, the coherence efficiency, which is a function of effective fringe visibility, is shown to be a valid performance metric for pulsed-source digital holography.

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Deep-turbulence wavefront sensing using digital holography in the on-axis phase shifting recording geometry with comparisons to the self-referencing interferometer

Cited by 36 publications

References 26 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

Digital holography experiments with degraded temporal coherence

Spectral Broadening Effects on Pulsed-Source Digital Holography

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