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ThorlabsWedge Prism

There are multiple non-contact methods to measure wedge or parallelism. Autocollimators are a common device used in the optics industry to do this. When light passes through an optical wedge, the beam is deflected by some angle, δ, which is defined by the refractive index of the glass, n, and the glass’s mechanical wedge angle, α. The calculation for this is given by the formula: δ = (n-1) · α.

The ocular lenses are the lenses closest to the eye and usually have a 10x magnification. Since light microscopes use binocular lenses there is a lens for ...

While the ocular lens focuses purely on magnification, the objective lens performs other functions, such as controlling the overall quality and clarity of the ...

Wedge prismuse

The setup for measuring wedge of a plano optic is shown in the setup in the image. The transmission flat (TF) and reference flat (RF) make a cavity with the wedge optic in between. To reduce environmental errors, the distance between all components should be as small as possible.

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Wedgeangle formula

Wedge PrismScope

For optical systems containing windows, measuring wedge can reduce error and increase efficiency. Autocollimators are useful in measuring a window’s wedge, but the results are much less precise than those of an interferometer and are dependent of operator variability. For this reason, ZYGO recommends the use of interferometry to measure the wedge of a window.

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Opticalprism

While this method is useful, the accuracy and reproducibility of the results are dependent on having a skilled operator. It is also necessary to have a target mirror that is flat to λ/4 or better to ensure that the return image is sufficiently well focused. In addition to all of the measurement capabilities that an interferometer has, it is also useful in measuring the wedge of a window under certain conditions.

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The performance of optical systems such as telescopes, camera lenses, and laser systems rely on the quality of the optical components within the systems. Many plano optical components appear completely parallel from a side view, however there is typically some wedge between the sides. In extremely precise systems, knowing the degree of a window’s wedge is crucial.

NightforceWedge Prism

Optical design software by Lambda Research offers powerful solutions for optimizing optical systems. Trusted by professionals for over 30 years.

Available in various sizes. (Sizes are approximate.) Each filter is covered on both sides with a thin protective film which needs to be removed before use.

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1. To cause the positive and negative electric charges in an object, such as an atom or molecule, to become separated from each other. This is typically done by ...

Spatial filters are designed for use with lasers to "clean up" the beam. Oftentimes, a laser system does not produce a beam with a smooth intensity profile. In ...

Collimation increases the danger of "direct beam viewing", where the beam shines directly in your eye. The danger of viewing a diffuse ...

The compound microscope has two systems of lenses for greater magnification, 1) the ocular, or eyepiece lens that one looks into and 2) the objective lens ...