What is collimated beam of light?
How to minimize the divergence of a collimated beam?
- To minimize divergence of a collimated beam two factors must be balanced: focal length of the collimating system and size of the light source. Equation 1 approximates the divergence of a collimated beam:
What is the M2 factor in beam collimation?
- For beams with non-ideal beam quality, the Rayleigh length is effectively reduced by the so-called M2 factor, so that the beam waist radius needs to be larger for a beam to be collimated. When describing a collimated beam with light rays, it consists of essentially parallel rays only.
How do you check the collimation of a beam?
- The collimation can be checked, for example, by measuring the evolution of beam radius over some distance in free space, via a Shack–Hartmann wavefront sensor, or with certain kinds of interferometers. In fiber optics, one often uses fiber collimators.
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