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  2. Beam expander - Wikipedia

    en.wikipedia.org/wiki/Beam_expander

    A refracting telescope commonly used is the Galilean telescope which can function as a simple beam expander for collimated light. The main advantage of the Galilean design is that it never focuses a collimated beam to a point, so effects associated with high power density such as dielectric breakdown are more avoidable than with focusing ...

  3. Collimated beam - Wikipedia

    en.wikipedia.org/wiki/Collimated_beam

    Most amateur reflector telescopes need to be re-collimated every few years to maintain optimum performance. This can be done by simple visual methods such as looking down the optical assembly with no eyepiece to make sure the components are lined up, by using a Cheshire eyepiece, or with the assistance of a simple laser collimator or ...

  4. Red dot sight - Wikipedia

    en.wikipedia.org/wiki/Red_dot_sight

    Some manufacturers modify the focus of the LED/optical collimator combination, making models with the optical collimator set to focus the dot at a finite distance. These have a maximum amount of parallax due to eye movement, equal to the size of the optical window, at close range, diminishing to a minimal amount at the set distance (somewhere ...

  5. Collimator - Wikipedia

    en.wikipedia.org/wiki/Collimator

    Example of a particle collimator. A collimator is a device which 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., make collimated light or parallel rays), or to cause the spatial cross section of the beam to become smaller (beam limiting device).

  6. Cheshire eyepiece - Wikipedia

    en.wikipedia.org/wiki/Cheshire_eyepiece

    A Cheshire eyepiece or Cheshire collimator is a simple tool that helps aligning the optical axes of the mirrors or lenses of a telescope, a process called collimation. It consists of a peephole to be inserted into the focuser in place of the eyepiece. Through a lateral opening, ambient light falls on the brightly painted oblique back of the ...

  7. Autocollimator - Wikipedia

    en.wikipedia.org/wiki/Autocollimator

    "Metrology system for inter-alignment of lasers, telescopes, and mechanical datum". Duma Optronics; Aharon, Oren. "Telescopic Analyzing System Tests Laser Collimation and Propagation". Duma Optronics. Archived from the original on 5 June 2017; Aharon, Oren. "Laser Autocollimator and Bore Sighting". Duma Optronics.

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