CONSTITUTION:For a concave reflecting surface 13a, an electromagnetic operation valve 10a is closed through the operation of a control part 12 and an electromagnetic operation valve 10b is opened to connect the pressure chamber 5 to a vacuum pump piping system 9b, thereby producing negative pressure...
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In the terahertz (THz) region, the corresponding wavelengths are located in the range of 30–3000 μm, which is much larger than the wavelength of visible light. Due to the lack of natural materials with high transmittance in the THz region, the THz devices are developed relatively ...
Ultrathin transmission metasurface devices are designed on the basis of the Yang-Gu amplitude-phase retrieval algorithm for focusing the terahertz (THz) radiation into four or nine spots with focal spacing of 2 or 3 mm at a frequency of 0.8 THz. Th
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Some authors define the focal length to be negative in the situation of Figure 2 because the focal point is located before the front principal plane; others take the absolute value. Figure 2: The front focal point is related to parallel rays on the back side (= output side). The optical...
The plano concave lens is used to diverge the parallel light outward. The focal length of the flat concave lens is negative and the spherical aberration is also negative. It can be used to correct the phase difference, spheric...
1. A retrofocus wide-angle objective lens system with large relative aperture comprising eight optically aligned lens components of which the first component is a concave meniscus lens of rearward concavity, the second component is a convex lens, the third component is a concave meniscus lens of...
What is claimed is: 1. A display device, comprising: a waveguide configured to propagate visible light under total internal reflection in a direction parallel to a major surface of the waveguide; an outcoupling element formed on the waveguide and configured to outcouple a portion of the visible...
The invention relates to a high-resolution 3.6-mm fixed-focus miniature lens. The high-resolution 3.6-mm fixed-focus miniature lens comprises an optical system arranged in a primary mirror tube. The optical system comprises a negative crescent lens, a biconvex lens A, a biconvex lens B and ...