A collimator is a system that obtains a parallel "beam" from a diverging beam (of light, electrons, etc.). It serves to homogenize the paths or rays that, emitted by a source, go out in all directions and obtain a jet of particles or set of rays with the same properties.
A collimator is, by definition, a precision instrument for a special task. The objective of collimation is to make the optical axis of each lens or mirror coincide with the central ray of the system, a collimating laser must achieve such a beam.
The unit must be light, robust and precision made to fit standard tubes. You should create a small, highly visible spot, day or night, at distances generally found in the path of a telescope.
Also, the beam should not drift off the axis or become a diffuse patch of light with changes in temperature, as can happen with some laser diodes.
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