While power/ energy for NIR lasers can be measured by a conventional thermopile sensor with water cooling, other parameters such as Spot Size, Beam shape, Focal position, and M2 require more advanced techniques to measure high power laser parameters without distorting them or damaging the analytical equipment. There are three methods to perform this task: (a) indirect measurement, (b) scanning tip with pinhole, and (c) direct measurement with CCD beam profiler.
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