Single-shot complex amplitude measurement technique in rhombic Fourier region using tilted reference light

Nobuhiro Yamagishi; Atsushi Okamoto; Akihisa Tomita

doi:10.1117/12.3006574

20 September 2023 Single-shot complex amplitude measurement technique in rhombic Fourier region using tilted reference light

Nobuhiro Yamagishi, Atsushi Okamoto, Akihisa Tomita

Author Affiliations +

Proceedings Volume 12608, Biomedical Imaging and Sensing Conference; 1260808 (2023) https://doi.org/10.1117/12.3006574
Event: Optics and Photonics International Congress, 2023, Yokohama, Japan

Abstract

We propose a new single-shot highly accurate digital holography technique using a single image sensor. The signal light passes through a rhombic low pass filter optical element, and the optical axis of the reference light is slightly tilted. The interference fringe of the signal and reference light is captured by the image sensor. In the computer, the signal intensity only used in the calculation process is calculated by the original three-step algorithm that can cancel the effect of a linear signal phase in adjacent pixels. The Fourier plane of the signal component obtained by subtracting the signal and reference intensity consists of the real and imaginary parts of the signal light inside and outside the rhombic region, respectively. The complex amplitude consisting of the real and imaginary parts is the reconstruction image of signal light that passed the rhombic low pass filter. The complex amplitude includes noise, so the additional process of the noise suppression is applied and improves measurement accuracy. After the process, the final reconstruction image is obtained. To confirm the operation principle, numerical analysis is conducted. In numerical analysis, the SNRs of the reconstructed intensity and phase in this method were 9.34 and 4.18 dB higher than the two-step parallel method, respectively, and 12.12 and 6.21 dB higher than Fourier fringe analysis, respectively.

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Nobuhiro Yamagishi, Atsushi Okamoto, and Akihisa Tomita "Single-shot complex amplitude measurement technique in rhombic Fourier region using tilted reference light", Proc. SPIE 12608, Biomedical Imaging and Sensing Conference, 1260808 (20 September 2023); https://doi.org/10.1117/12.3006574

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KEYWORDS

Complex amplitude

Image sensors

Fringe analysis

Image restoration

Numerical analysis

Signal processing

Digital holography

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