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Bitelecentric lens

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Slit spacing · A diffraction grating is made of many slits. · If there are 1000 slits per metre, then slit spacing is 1/1000 metres. · In general, if there are ...

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Polymer optical fibers (POF) have a number of advantages over glass fibers, such as low cost, flexibility, low weight, electromagnetic immunity, good bandwidth, ...

2Unidad Académica de Física, Universidad Autónoma de Zacatecas, Calz. Solidaridad, Esquina Paseo de la Bufa s/n, Zacatecas 98060, Mexico

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1Unidad Académica de Ingeniería Eléctrica, Universidad Autónoma de Zacatecas, Av. Ramón López Velarde 801, Zacatecas 98000, Mexico

Jesús Villa, Gustavo Rodríguez, Ismael de la Rosa, Rumen Ivanov, Tonatiuh Saucedo, and Efrén González J. Opt. Soc. Am. A 31(12) 2719-2722 (2014)

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The slider is used to adjust the size of the condenser aperture diaphragm until it is somewhere between two-thirds and four-fifths the diameter of the fully ...

Precision Pinholes · Available in Aperture Mounts for a Secure Mechanical Support · Pinhole Sized Ranging from 1 to 1,000 Microns · High Power Apertures Available ...

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It features a 10 MOA green illuminated dot with 2 brightness settings. Easily acquire your target with the windage and elevation adjustment. This green dot ...

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Reliable and accurate testing methods are essential to guiding the polishing process during the figuring of optical telescope mirrors. With the natural advancement of technology, the procedures and instruments used to carry out this delicate task have consistently increased in sensitivity, but also in complexity and cost. Fortunately, throughout history, the Foucault knife-edge test has shown the potential to measure transverse aberrations in the order of the wavelength, mainly when described in terms of physical theory, which allows a quantitative interpretation of its characteristic shadowmaps. Our previous publication on this topic derived a closed mathematical formulation that directly relates the knife-edge position with the observed irradiance pattern. The present work addresses the quite unexplored problem of the wavefront’s gradient estimation from experimental captures of the test, which is achieved by means of an optimization algorithm featuring a proposed ad hoc cost function. The partial derivatives thereby calculated are then integrated by means of a Fourier-based algorithm to retrieve the mirror’s actual surface profile. To date and to the best of our knowledge, this is the very first time that a complete mathematical-grounded treatment of this optical phenomenon is presented, complemented by an image-processing algorithm which allows a quantitative calculation of the corresponding slope at any given point of the mirror’s surface, so that it becomes possible to accurately estimate the aberrations present in the analyzed concave device just through its associated foucaultgrams.

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1/4" Drive 6 Point Mid Length Metric Socket 8mm · Features. Mid-length design for access to fasteners in hard-to-reach places; Off-corner loading reduces ...

The EF 50mm lenses are a group of normal prime lenses made by Canon that share the same focal length. These lenses are based on the classic double-Gauss ...

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Pocket Magnifier • Small and easy to handle. • 10x magnification makes it easy to see the column end to verify a square cut. Product Name: Pocket Magnifier ...