## 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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