Hardware assembly or optical device, such as a mirror, capable of changing laser beam direction; used to re-point the beam and in folded, compact delivery systems.
Beam Diameter
The diameter of that portion of the beam which contains 86% of the output power.
Beam Divergence
The increase in the diameter of the laser beam with distance from the exit aperture, based on the full angle at the point where the irradiance (or radiant exposure for pulsed lasers) is 1/e times the maximum value. Symbol: Ф
Beam Expander
Optical device increasing beam diameter and reducing divergence. Result: A smaller focused spot for more distance between lens and part.