Gentec-EO's popular Gentec-EO Academia Youtube channel includes a great selection of videos covering every aspect of laser beam measurement.
Here is a selection, but please visit the channel to see the full range.
Introducing MIRO.
Your first measurement with a PRONTO-250 laser power meter.
Correction factors in laser beam measurement: when to use them and why.
Same laser, different measurement: what's the problem.
In-line monitoring of high-power laser beams.