Optical apertures

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by M Beresna · 2014 · Cited by 247 — Thanks to the unique properties of light–matter interaction on the ultrashort time scale, this direct writing technique has led to observation of unique ...

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May 18, 2015 — Installing plastic optical fiber (POF) cabling may be the better choice for networking with infrastructure runs of up to 80 meters that connect ...

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Steven M. Beck, Joseph R. Buck, Walter F. Buell, Richard P. Dickinson, David A. Kozlowski, Nicholas J. Marechal, and Timothy J. Wright

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Zhiwei Sun, Peipei Hou, Ya’nan Zhi, Jianfeng Sun, Yu Zhou, Qian Xu, Zhiyong Lu, and Liren Liu Appl. Opt. 53(9) 1846-1855 (2014)

Irisaperture

The spatial resolution of a conventional imaging laser radar system is constrained by the diffraction limit of the telescope’s aperture. We investigate a technique known as synthetic-aperture imaging laser radar (SAIL), which employs aperture synthesis with coherent laser radar to overcome the diffraction limit and achieve fine-resolution, long-range, two-dimensional imaging with modest aperture diameters. We detail our laboratory-scale SAIL testbed, digital signal-processing techniques, and image results. In particular, we report what we believe to be the first optical synthetic-aperture image of a fixed, diffusely scattering target with a moving aperture. A number of fine-resolution, well-focused SAIL images are shown, including both retroreflecting and diffuse scattering targets, with a comparison of resolution between real-aperture imaging and synthetic-aperture imaging. A general digital signal-processing solution to the laser waveform instability problem is described and demonstrated, involving both new algorithms and hardware elements. These algorithms are primarily data driven, without a priori knowledge of waveform and sensor position, representing a crucial step in developing a robust imaging system.

Numericalaperture

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The spatial resolution of a conventional imaging laser radar system is constrained by the diffraction limit of the telescope’s aperture. We investigate a technique known as synthetic-aperture imaging laser radar (SAIL), which employs aperture synthesis with coherent laser radar to overcome the diffraction limit and achieve fine-resolution, long-range, two-dimensional imaging with modest aperture diameters. We detail our laboratory-scale SAIL testbed, digital signal-processing techniques, and image results. In particular, we report what we believe to be the first optical synthetic-aperture image of a fixed, diffusely scattering target with a moving aperture. A number of fine-resolution, well-focused SAIL images are shown, including both retroreflecting and diffuse scattering targets, with a comparison of resolution between real-aperture imaging and synthetic-aperture imaging. A general digital signal-processing solution to the laser waveform instability problem is described and demonstrated, involving both new algorithms and hardware elements. These algorithms are primarily data driven, without a priori knowledge of waveform and sensor position, representing a crucial step in developing a robust imaging system.

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Steven M. Beck, Joseph R. Buck, Walter F. Buell, Richard P. Dickinson, David A. Kozlowski, Nicholas J. Marechal, and Timothy J. Wright

Comments Section ... Yes, it's quite possible! You need at least two magnifying glasses, with two different focal-lengths. E.g. if you use one ...

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The stereo- or dissecting microscope is an optical microscope variant designed for observation with low magnification (2 - 100x) using incident light ...

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D Clarke · 1974 · 10 — The emergent pattern described by the locus of the tip of the vector is known as the polarization figure; according to the magnitude of the resolved components ...

Oct 27, 2022 — The application of polarizer film sheet. LCD Polarizer Film is an important part of LCD modules. It is made of high-quality polyethylene ...

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