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Thorlabs offers concave mirrors with both metallic and dielectric stack reflective coatings. Metallic-coated mirrors offer relatively high reflectance (90-95%) over a wide wavelength range, while dielectric-coated mirrors provide even higher reflectance (>99%) but over a smaller wavelength range. See the table to the right for an overview of the various coatings we offer for our concave mirrors. All coating options are available on optics with diameters ranging from Ø1/2" to Ø75 mm. Metallic mirrors are available with focal lengths from 9.5 - 1000 mm, while dielectric mirrors are available with focal lengths from 12 - 1000 mm.

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What is collimatorin physics

The figure to the right illustrates how a Söller collimator is used in neutron and X-ray machines. The upper panel shows a situation where a collimator is not used, while the lower panel introduces a collimator. In both panels the source of radiation is to the right, and the image is recorded on the gray plate at the left of the panels.

Mirror coatings serve multiple purposes. First and foremost, they provide protection, blocking harmful rays from damaging your eyes.

What is collimatorin radiology

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Collimators are used in linear accelerators used for radiotherapy treatments. They help to shape the beam of radiation emerging from the machine, they can limit the maximum field size of a beam. The treatment head of a linear accelerator consists of both a primary and secondary collimator. The primary collimator is positioned after the electron beam has reached a vertical orientation. When using photons, it is placed after the beam has passed through the X-ray target. The secondary collimator is positioned after either a flattening filter (for photon therapy) or a scattering foil (for electron therapy). The secondary collimator consists of two jaws which can be moved to either enlarge or reduce the size of the treatment field.

New systems involving multileaf collimators (MLCs) are used to further shape a beam to localise treatment fields in radiotherapy. MLCs consist of approximately 50–120 leaves of heavy, metal collimator plates which slide into place to form the desired field shape.

What is collimatorused for

In optics, a collimator may consist of a mirror or lens with some type of light source and/or an image at it's focus. This can be used to replicate a target at infinity without parallax. Optical collimators can be used to calibrate other optical devices[1], to check if all elements are aligned on the optical axis, to set elements at proper focus, or to align two or more devices such as binoculars and gun barrels/gunsights[2].

Although collimators improve the resolution, by blocking incoming radiation they also reduce the intensity of the signal, a property that would not be desired for remote sensing instruments that are detecting very small signals as it is. For that reason, the gamma ray spectrometer on Mars Odyssey which is currently orbiting over Mars, for example, is a non-collimated instrument. Most lead collimators let less than 1% of incident photons through. For this reason, attempts have been made to replace collimators with electronic analysis.

Below are reflectance plots for our metallic-, dielectric-, and crystalline-coated concave mirrors. To view our selection of mirrors available with a particular coating, either click on the graphed line of interest or the corresponding coating name in the legend. Graphs for the matallic- and dielectrc-coated mirrors are shown for an angle of incidence (AOI) of 8 or 6 degrees. Graphs for the crystalline-coated mirrors are shown for an AOI of 0 degrees.

use ofcollimatorin x-ray

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Thorlabs' UV-Enhanced Aluminum-Coated Concave Mirrors are designed for light collection, imaging, and focusing applications. These reflective optics focus light without chromatic aberration, making them especially suitable for broadband sources.

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Without a collimator rays from all directions will be recorded; for example, a ray that has passed through the top of the specimen (to the right of the diagram) but happens to be travelling in a downwards direction may be recorded at the bottom of the plate. The resultant image will be so blurred and indistinct as to be useless.

Collimatordiagram

What is collimatorin spectrometer

The shaded regions in the graphs denote the ranges over which we guarantee the specified reflectance. Please note that the reflectance outside of these bands is typical and can vary from lot to lot, especially in out-of-band regions where the reflectance is fluctuating or sloped.

What is collimatorin X ray

Optical collimators are also used in gunsights[3] and other pointing devices to give the viewer an image of a reticle at infinity.

What is collimatorbeam

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These mirrors offer >90% average reflection in the ultraviolet spectral range from 250 - 450 nm. They consist of an N-BK7 substrate with a UV-enhanced protected aluminum coating. With low surface irregularity at 633 nm, these mirrors provide excellent image quality.

A collimator is a device that narrows a beam of particles or waves. To "narrow" can mean either to cause the directions of motion to become more aligned in a specific direction (i.e. collimated or parallel) or to cause the spatial cross section of the beam to become smaller.

In neutron, X-ray and gamma ray optics, a collimator is a device that filters a stream of rays so that only those traveling parallel to a specified direction are allowed through. Collimators are used in neutron, X-ray, and gamma-ray optics because it is not yet possible to focus radiation with such short wavelengths into an image through the use of lenses as is routine with electromagnetic radiation at optical or near-optical wavelengths.

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Please contact Tech Support for custom versions of these optics. Thorlabs also offers dielectric concave mirrors that provide higher reflectivity than metal mirrors at the expense of operating over a more narrow wavelength range.

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In the lower panel of the figure, a collimator has been added (blue bars). This is a sheet of lead or other material opaque to the incoming radiation with many tiny holes bored through it. Only rays that are travelling nearly parallel to the holes will pass through them—any others will be absorbed by hitting the plate surface or the side of a hole. This ensures that rays are recorded in their proper place on the plate, producing a clear image.