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- W4226450380 endingPage "1" @default.
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- W4226450380 abstract "Optically transmissive and reflective objects may have varying surface profiles, which translate to arbitrary phase profiles for light either transmitted through or reflected from the object. For high-throughput applications, resolving arbitrary phases and absolute heights is a key problem. To extend the ability of measuring absolute phase jumps in existing 3D imaging techniques, the dual-wavelength concept, proposed in late 1800s, has been developed in the last few decades. By adopting an extra wavelength in measurements, a synthetic wavelength, usually larger than each of the single wavelengths, can be simulated to extract large phases or height variations from micron-level to tens of centimeters scale. We review a brief history of the developments in the dual-wavelength technique and present the methodology of this technique for using the phase difference and/or the phase sum. Various applications of the dual-wavelength technique are discussed, including height feature extraction from micron scale to centimeter scale in holography and interferometry, single-shot dual-wavelength digital holography for high-speed imaging, nanometer height resolution with fringe subdivision method, and applications in other novel phase imaging techniques and optical modalities. The noise sources for dual-wavelength techniques for phase imaging and 3D topography are discussed, and potential ways to reduce or remove the noise are mentioned." @default.
- W4226450380 created "2022-05-05" @default.
- W4226450380 creator A5053513516 @default.
- W4226450380 creator A5073439907 @default.
- W4226450380 creator A5088516029 @default.
- W4226450380 date "2022-01-01" @default.
- W4226450380 modified "2023-10-18" @default.
- W4226450380 title "A review of the dual-wavelength technique for phase imaging and 3D topography" @default.
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