Rami Arieli: "The Laser Adventure"

Rami Arieli: "The Laser Adventure" Chapter 7 Section 2, page 3

Example 7.3: Beam Divergence

The beam diameter out of He-Ne laser is 4 [mm] at a distance of 2 [m] away from the laser.

At a distance of 5 meters, the beam expands to 7 [mm].

Calculate the beam divergence.

Solution to Example 7.3

Using the equation for beam divergence:

This is a typical beam divergence of He-Ne lasers.