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

Liu, Lei; Shan, Mingguang; Zhong, Zhi

doi:10.1088/2040-8986/aac3a6

Cited by 5 publications

(3 citation statements)

References 32 publications

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“…Optical interferometer [1][2][3][4][5][6][7][8][9] is a promising tool for quantitative phase imaging [4][5][6][7][8][9][10], and has been applied wildly in the measurement of micro structures, biological specimens and surface profiles. According to the coincidence of the object beam path and the reference beam path, the interferometer can be categorized into two types: separated-path interferometer [1][2][3] and common-path interferometer [11][12][13][14]. In the separated-path interferometer, the object beam and reference beam travel through different optical paths and suffer from different environmental disturbance, and the superposition of two beams would amplify the noise.…”

Section: Introductionmentioning

confidence: 99%

Single shot point-diffraction interferometer by a plate beamsplitter

Shan,

Yin,

Zhong

et al. 2024

Phys. Scr.

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A single shot point-diffraction interferometer is proposed in this paper, in which one plate beamsplitter is assembled with one mirror and one pinhole array to duplicate an object beam and generate one object beam and one reference beam. One mirror is placed perpendicularly at the rear of the optical 4f system, while one thin plate beamsplitter is placed ahead of the mirror with an inclined angle. With the help of the half-transmission and half-reflection of the plate beamsplitter, one object beam is duplicated into to copies. Owning to the different angles of the plate beamsplitter and the mirror with respect to the optical axis, after Fourier transformed by the second Lens of the 4f system and reflected by the cube beamsplitter, the two copies are separated in the spectral domain. Then, one object beam and one reference beam are generated by the pinhole array placed at the spectral plane. The object and reference beams are Fourier transformed by the third Lens and interferes to generate an off-axis interferogram at the camera. By adjusting the inclined angle of the plate beamsplitter, the carrier frequency of the interferogram can be modulated easily. Therefore, this interferometer has a simple optical setup, easy optical implementation and outstanding measurement ability with high precision, measurement efficiency and stability. Several experimental results will be provided to demonstrate the effectiveness of the proposed system.

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Section: Introductionmentioning

confidence: 99%

Single shot point-diffraction interferometer by a plate beamsplitter

Shan,

Yin,

Zhong

et al. 2024

Phys. Scr.

Self Cite

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“…For the reflection-mode DHM, the measurement range is half the optical wavelength. When measuring microstructures, such as steps and grooves, of which the depths are larger than half the optical wavelength, dual-wavelength DHM is used to unwrap the phase [3][4][5]. In dual-wavelength DHM, the difference of two optical phases, j 1 and j 2 , is calculated as j D =j 1 −j 2 , which corresponds to a longer synthetic wavelength, Λ D =λ 1 λ 2 /(λ 2 −λ 1 ).…”

Section: Introductionmentioning

confidence: 99%

Hierarchical phase unwrapping for dual-wavelength digital holographic microscopy

Liu¹,

Li²,

Huang³

et al. 2020

J. Opt.

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Dual-wavelength digital holographic microscopy (DHM) can extend ambiguity range in phase unwrapping by synthesizing a much longer beat wavelength, but it suffers from phase error amplification that destroys the vertical sensitivity and accuracy. To achieve a better vertical sensitivity and avoid height jump phenomenon, a hierarchical method is presented to construct a wavelength chain and unwrap the phase gradually from long to short wavelengths. This method could improve the vertical sensitivity by synthesizing a shorter wavelength and avoid height jump by reducing the estimation error of integer part of phase order. Theoretical analysis, simulations, and experiments demonstrate the effectiveness of the hierarchical method to attenuate the height jump and preserve vertical sensitivity in dual-wavelength DHM phase unwrapping. The method is simple and deterministic, and only costs a few milliseconds for unwrapping a typical phase map of mega pixels.

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“…The contribution of the vibrations, airflow and other parasitic effects into two beams is practically identical, and thus the noise in the final interference pattern is significantly reduced. Several CPI designs of add-on modules for light microscopes were proposed based on diffraction gratings [5,6,9,10], special arrangement of apertures and polarizers [11], holographic optical elements [12], Sagnac interferometer [13], spatial light modulator [14][15][16] or digital micromirror device [17].…”

Section: Introductionmentioning

confidence: 99%

Lens-in-lens common-path interferometer for quantitative phase imaging

Мачихин

Polschikova

Vlasova

et al. 2019

J. Opt.

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We introduce a common-path interferometer (CPI) based on a two-component confocal scheme where the first component consists of two decentered lenses (lens-in-lens). Compactness, high stability and easy alignment of the proposed scheme allow building precise and robust tools for the analysis of the wave front reflected from the object or transmitted through it. We demonstrate its effectiveness for quantitative phase imaging of microscopic objects. The proposed CPI may be implemented as an attachable module to conventional light microscope to enable digital holographic imaging mode.

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

Cited by 5 publications

References 32 publications

Single shot point-diffraction interferometer by a plate beamsplitter

Single shot point-diffraction interferometer by a plate beamsplitter

Hierarchical phase unwrapping for dual-wavelength digital holographic microscopy

Lens-in-lens common-path interferometer for quantitative phase imaging

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