The BGP-LBS-300s-UV-CAL-LT665 focal spot analyzer (P/N SP90481) measures laser beam power distribution and focal spot size for wavelengths from 266 to 355 nm. The average power can be from <1 to 400 Watts and the focal spot can be as small as 46 µm. The FSA can also be used to measure how the focal spot shifts with power during its critical start-up phase. BeamGage Professional software is included.