For beams with a waist width ≥3mm the placement almost always yields a focus near the lens focal length,
therefore placement is not critical.
The following figures show how the beam width of the focused input laser changes under a range of different
conditions. In this image, the focused spot size is plotted against the input waist location for a variety of input
beam sizes shown representing only M
2
= 1.
Focused spot sizes are always larger when M
2
> 1. The next image depicts the focused spot sizes for larger
input beam sizes also with M
2
= 1. Notice that around 5mm the focused spot size falls below the 800μm
dotted line which represents the resolution limit of the camera. For these larger beams, a change in the M
2
value will significantly impact the operating range.
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