Dual-wavelength off-axis quasi-common path digital holography using polarization multiplexing and flipping

Lei Liu; Zhi Zhong; Mingguang Shan; Bin Liu; Guangyu Luan; Ming Diao; Yabin Zhang

doi:10.1117/12.2512018

7 March 2019 Dual-wavelength off-axis quasi-common path digital holography using polarization multiplexing and flipping

Lei Liu, Zhi Zhong, Mingguang Shan, Bin Liu, Guangyu Luan, Ming Diao, Yabin Zhang

Proceedings Volume 11053, Tenth International Symposium on Precision Engineering Measurements and Instrumentation; 110530O (2019) https://doi.org/10.1117/12.2512018
Event: 10th International Symposium on Precision Engineering Measurements and Instrumentation (ISPEMI 2018), 2018, Kunming, China

Abstract

We build a two-wavelength off-axis quasi-common-path digital holography for quantitative phase imaging (QPI) using polarization-multiplexing and flipping. The interference is performed by flipping the relative position of a sample and reference beam, and the dual-wavelength information is spatially multiplexed onto a monochromatic CCD camera simultaneously using polarization-multiplexing. Due to orthogonal interference fringes of two-wavelengths, the unwrapped information on the phase and thickness for the sample can be extracted from a single interferogram. Our setup requires no pinholes, gratings or dichroic mirror with straightforward alignment. Additionally, a division algorithm for dual-wavelength off-axis digital holography with the help of a specimen-free multiplexed interferogram is proposed to extract the phase of a specimen. We demonstrate the operation of the setup with step target and circular pillar.

Citation Download Citation

Lei Liu, Zhi Zhong, Mingguang Shan, Bin Liu, Guangyu Luan, Ming Diao, and Yabin Zhang "Dual-wavelength off-axis quasi-common path digital holography using polarization multiplexing and flipping", Proc. SPIE 11053, Tenth International Symposium on Precision Engineering Measurements and Instrumentation, 110530O (7 March 2019); https://doi.org/10.1117/12.2512018

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KEYWORDS

Multiplexing

Digital holography

Spatial frequencies

Fourier transforms

Detection and tracking algorithms

Beam splitters

CCD cameras

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