Depth-resolved and auto-focus imaging through scattering layer with wavelength compensation

Liang, Jinbo; Cai, Jiefan; Xie, Junpeng; Xie, Xiangsheng; Zhou, Jianying; Yu, Xiangyang

doi:10.1364/josaa.36.000944

Cited by 5 publications

(2 citation statements)

References 30 publications

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“…is a constant number). This situation has permitted depth access in speckle imaging using spatio-spectral correlations [24] [25]. Second, under convergent illumination and observation close to the optical axis ((𝑢, 𝑣) ≈ (0,0)), the second term vanishes and a parabolic phase remains, leaving an invariance with respect to the dependence 𝜆𝑧.…”

Section: Spatial Extent Of the Refocus 3d Bandwidthmentioning

confidence: 99%

Focusing large spectral bandwidths through scattering media

Vesga¹,

Hofer²,

Balla³

et al. 2019

Opt. Express

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Wavefront shaping is a powerful method to refocus light through a scattering medium. Its application to large spectral bandwidths or multiple wavelengths refocusing for nonlinear bio-imaging in-depth is however limited by spectral decorrelations. In this work, we demonstrate ways to access a large spectral memory of a refocus in thin scattering media and thick forward-scattering biological tissues. First, we show that the accessible spectral bandwidth through a scattering medium involves an axial spatio-spectral coupling, which can be minimized when working in a confocal geometry. Second, we show that this bandwidth can be further enlarged when working in a broadband excitation regime. These results open important prospects for multispectral nonlinear imaging through scattering media.

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Section: Spatial Extent Of the Refocus 3d Bandwidthmentioning

confidence: 99%

Focusing large spectral bandwidths through scattering media

Vesga¹,

Hofer²,

Balla³

et al. 2019

Opt. Express

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show abstract

“…In the reciprocal spectral domain, a chromato-axial (χ -axial) ME was recently observed [16], yielding an axial displacement of a focused spot in response to a ∼100 nm chromatic shift through 1-mm-thick forward-scattering biological tissues. Through thin diffusers, such correlations could be shown to be useful for 3D imaging [17,18] but can be mostly accounted for by invariance properties of the Fresnel propagation equation [16,17,19]. Conversely, thick diffusers involve optical path lengths much longer than the wavelength, and narrow spectral correlations would be expected at the diffuser output.…”

Section: Introductionmentioning

confidence: 99%

Chromato-axial memory effect through a forward-scattering slab

Zhu¹,

Monvel²,

Berto³

et al. 2020

Optica

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Light propagation through scattering samples involves long optical path lengths typically resulting in short spectral correlation widths. Here, we demonstrate experimentally and theoretically a chromato-axial memory effect through volumetric forward-scattering slabs of thickness lying in the range between the scattering mean free path and the transport mean free path: a spectral shift of the impinging collimated beam results in an axial homothetic dilation of the speckle pattern over large spectral widths. The center of the homothety is shown to lie at a virtual plane located at 1/(3n) of the slab thickness L, before the output surface. These results provide new tools to blindly control wavefields through scattering samples.

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Image Definition Evaluation Function Based on Improved Maximum Local Variation and Focusing Window Selection

Chen

Wan

et al. 2021

Data Mining and Big Data

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Depth-resolved and auto-focus imaging through scattering layer with wavelength compensation

Cited by 5 publications

References 30 publications

Focusing large spectral bandwidths through scattering media

Focusing large spectral bandwidths through scattering media

Chromato-axial memory effect through a forward-scattering slab

Image Definition Evaluation Function Based on Improved Maximum Local Variation and Focusing Window Selection

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