Abstract
Construction and performance of a low-cost easy-to-build CO2 laser beam profile monitor are described. Its specifications correspond to those of commercial devices. In this monitor a small slit covered by a temperature dependent fluorescent surface is imaged on a photodiode. A rotating mirror scans the spatial intensity distribution over the slit. This allows one to avoid an expensive photodiode array. The signal-to-noise ratio is improved by repetitive sampling with a low-cost digital processing unit. The dynamic range of measurement is 7 to 1 and the linearity is 10% within this range.
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