Application of complex field imaging sensor to additive manufacturing

Fresnel incoherent correlation holography (FINCH) is a technology that can acquire three-dimensional information of incoherent objects such as fluorescence with an in-line optical system. However, it is difficult to apply FINCH to dynamic phenomena, since FINCH has to detect phase-shifted holograms sequentially to eliminate twin and zero-order images. In this paper, a method in which the phase-shifted holograms can be obtained simultaneously with an in-line setup by using an optimized simulated diffraction optical element (sDOE), realized by a phase-only spatial light modulator, is proposed. The optimized sDOE is an optical device with a dual-focus lens, 2D grating, and spatial phase shifter. Therefore, the sDOE is called a dual-focus checkerboard lens. The optical experiment confirms the feasibility of the proposed method.

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Single-shot in-line Fresnel incoherent holography using a dual-focus checkerboard lens

Sakamaki

Yoneda

Nomura

2020

Appl. Opt.

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Performance analysis of phase retrieval using transport of intensity with digital holography [Invited]

et al. 2020

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The performance of direct and unwrapped phase retrieval, which combines digital holography with the transport of intensity, is examined in detail in this paper. In this technique, digital holography is used to numerically reconstruct the intensities at different planes around the image plane, and phase retrieval is achieved by the transport of intensity. Digital holography with transport of intensity is examined for inline and off-axis geometries. The effect of twin images in the inline case is evaluated. Phase-shifting digital holography with transport of intensity is introduced. The performance of digital holography with transport of intensity is compared with traditional off-axis single- and dual-wavelength techniques, which employ standard phase unwrapping algorithms. Simulations and experiments are performed to determine and compare the accuracy of phase retrieval through a mean-squared-error figure of merit as well as the computational speeds of the various methods.

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Application of complex field imaging sensor to additive manufacturing

Cited by 2 publications

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Single-shot in-line Fresnel incoherent holography using a dual-focus checkerboard lens

Single-shot in-line Fresnel incoherent holography using a dual-focus checkerboard lens

Performance analysis of phase retrieval using transport of intensity with digital holography [Invited]

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