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