Interferometric phase microscopy using slightly-off-axis reflective point diffraction interferometer

Bai, Hongyi; Zhong, Zhi; Shan, Mingguang; Liu, Lei; Guo, Lili; Zhang, Yabin

doi:10.1016/j.optlaseng.2016.10.011

Cited by 20 publications

(15 citation statements)

References 28 publications

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“…We can see that the results suffer from ambiguities in single wavelength images, but free-ambiguities in double-wavelength images. From the difference of both averages [26,30] of the line λ s in figure 4, we can calculate the step height as 2021.2 nm, which agrees well with the nominal height. Undeniably, the phase noise increases due to the phase difference.…”

Section: Resultssupporting

confidence: 73%

Simultaneous two-wavelength tri-window common-path digital holography

Liu

Shan

Zhong

2018

J. Opt.

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Two-wavelength common-path off-axis digital holography is proposed with a tri-window in a single shot. It is established using a standard 4f optical image system with a 2D Ronchi grating placed outside the Fourier plane. The input plane consists of three windows: one for the object and the other two for reference. Aided by a spatial filter together with two orthogonal linear polarizers in the Fourier plane, the two-wavelength information is encoded into a multiplexed hologram with two orthogonal spatial frequencies that enable full separation of spectral information in the digital Fourier space without resolution loss. Theoretical analysis and experimental results illustrate that our approach can simultaneously perform quantitative phase imaging at two wavelengths.

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Section: Resultssupporting

confidence: 73%

Simultaneous two-wavelength tri-window common-path digital holography

Liu

Shan

Zhong

2018

J. Opt.

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“…To demonstrate the feasibility of nFPRM, we first imaged a phase plate by using off-axis DH microscopy using a reflective point diffraction interferometer [20]. In the experiments, we used an He-Ne laser with λ = 632.8 nm as a light source and a CCD camera ---------------------atan = with a resolution of 1600 × 1200 pixels as a recorder, where each pixel had an area of 4.4 × 4.4 μm.…”

Section: Resultsmentioning

confidence: 99%

Fast phase reconstruction in off-axis digital holography with zero-order term suppression

Luan¹,

Shan²,

Zhong³

et al. 2020

Optica Applicata

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A fast phase reconstruction method (FPRM) employing a free-sample hologram can improve the efficiency of phase reconstruction in off-axis digital holography. However, the space-bandwidth product is still confined by spectrum aliasing in the hologram owing to the zero-order term. In this paper, we propose an FPRM that features an efficient zero-order term suppression method called the average gray that can eliminate spectrum shifting. We can implement phase reconstruction by considering both speed and the space-bandwidth product. We verified the validity of our approach for off-axis digital holography using laser and white-light illumination.

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“…To realize phase shifting, a Wollaston prism or a special cube beam-splitter was also utilized [8][9][10]. Some other commonpath SODHs with long-term stability and high robustness have also been proposed using polarization phase-shifting technique [11][12][13][14]. However, all of these methods acquire phase shift using polarization technique or special prisms.…”

Section: Introductionmentioning

confidence: 99%

“…Besides the experimental setup, another key point in SODH is to develop efficient algorithms with simpler processes and high reconstruction capability. The first author has realized a fast phase retrieval method in SODH based on specimen-free holograms captured by a prior measurement without any specimen [14], and it can be further sped up with spectrum cropping and multiplexing techniques [19]. However, the methods were only demonstrated on thin phase specimens.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast to the separated path SODHs [5][6][7][8], our method allows both the object and the reference beams pass through almost the same optical path, which makes it insensitive to environmental perturbations. Compared with the common-path phase-shifting SODHs in [9][10][11][12][13][14], our method requires no polarization elements or special prisms to introduce phase shift. Also, the phase shift between holograms in our method can be randomly selected using a reflective grating rather than fixed to a certain value as they did.…”

Section: Introductionmentioning

confidence: 99%

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Slightly off-axis flipping digital holography using a reflective grating

Bai

Min

Yang

et al. 2020

J. Opt.

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A slightly off-axis digital holography is proposed using the flipping interferometry with a reflective grating to obtain the quantitative phase distribution. The setup is established based on a modified 4f optical system using an improved flipping module with a reflective grating and a retro-reflector made of a two-mirror construction. The input plane of the system is divided into two windows: one for object beam and the other for reference beam. Employing the flipping module, the interference patterns can be obtained by flipping the images of the object and reference beams. By translating the +1 diffraction order of the reflective grating, two carrier holograms with a phase shift between them can be obtained in two exposures. The reconstructed quantitative phase distribution of a specimen can be acquired with a simple slightly off-axis retrieval method aided by specimen-free holograms. Many measurements on both thick and thin phase specimens are performed to prove the validity of our method.

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Interferometric phase microscopy using slightly-off-axis reflective point diffraction interferometer

Cited by 20 publications

References 28 publications

Simultaneous two-wavelength tri-window common-path digital holography

Simultaneous two-wavelength tri-window common-path digital holography

Fast phase reconstruction in off-axis digital holography with zero-order term suppression

Slightly off-axis flipping digital holography using a reflective grating

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