Collimated light | Wikipedia audio article
Channel: wikipedia tts
Date: 04/06/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Collimated_beam


00:01:15 1 Etymology
00:01:36 2 Sources
00:01:45 2.1 Lasers
00:02:34 2.2 Synchrotron light
00:03:05 2.3 Distant sources
00:04:02 2.4 Lenses and mirrors
00:04:48 2.5 Display system in flight simulators that uses collimated light
00:06:25 3 Collimation and decollimation
00:08:12 4 See also



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SUMMARY
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A collimated beam of light or other electromagnetic radiation has parallel rays, and therefore will spread minimally as it propagates. A perfectly collimated light beam, with no divergence, would not disperse with distance. Such a beam cannot be created, due to diffraction.Light can be approximately collimated by a number of processes, for instance by means of a collimator. Perfectly collimated light is sometimes said to be focused at infinity. Thus, as the distance from a point source increases, the spherical wavefronts become flatter and closer to plane waves, which are perfectly collimated.
Other forms of electromagnetic radiation can also be collimated. Collimation of X-rays is important in radiology. Reducing the size of the beam by collimation reduces the volume of the patient's tissue that is irradiated, and reduces intensity in the periphery of the beam. Peripheral x-rays can be absorbed by the patient's tissues and can generate scattered photons, which travel in many directions and cause film fog, reducing the quality of the x-ray image.