A completely collimated light beam would not scatter over distance if there was no divergence. However, any such beam cannot be produced due to diffraction.
The term "collimated" can also refer to particle beams, specifically a series of such absorbing collimators, which are often shielding blocks made of high density materials (such as lead, bismuth alloys, etc.) to absorb or block stray particles from a desired forward direction. Every particle accelerator complex in the world employs this technique of particle collimation on a regular basis. If the necessary reactions are included in any given experimental applications, a different, less well-studied approach of achieving the same forward collimation effect may use strategic nuclear polarization (magnetic polarization of nuclei).
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