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The Focal Spot Analyzer measures focus spot characteristics of high-power lasers in real time. The analyzer is a laser beam sampler/attenuator for camera-based laser beam profiling systems. Designed for material processing applications, such as drilling, ablating and marking, the analyzer attenuates YAG lasers with short, compact path lengths, from 50 millimeters to 200 millimeters. The analyzer supports powers levels from less than 1 watt to 400 watts and focal spot sizes as small as 25 micrometers. Adjustable attenuation up to 1 x 10-10 maximizes the system’s dynamic range. The system measures focal spot characteristics as well as how focal distance shifts with power. A modular, C-mount unit, the analyzer can be added to most charge-coupled device (CCD) cameras.