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Is your laser’s focus spot where you think it is? This video shows the focal shift of a 100 kW laser during the first four seconds of startup using BeamWatch, Ophir-Spiricon’s non-contact high power beam analyzer. Find out more here: https://www.ophiropt.com/laser–measurement/beam-profilers/products/High-Power-Beam-Profiling/BeamWatch

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You might think – as I used do – that offset is pretty simple.

Before measuring your laser, see if the meter displays a value.

If not, great. If it does, that’s unwanted, so press “Offset.”

However, the truth is there are several different kinds of offset and it’s important to understand a little bit about how thermal sensors work in order to know when to hit that offset button and when to resist.