Abstract

We demonstrate a paradigm in absolute laser radiometry where a laser beam’s power can be measured from its radiation pressure. Using an off-the-shelf high-accuracy mass scale, a 530 W Yb-doped fiber laser, and a 92 kW CO2 laser, we present preliminary results of absolute optical power measurements with inaccuracies of better than 7% to 13%. We find negligible contribution from radiometric (thermal) forces. We also identify this scale’s dynamic-force noise floor for a 0.1 Hz modulation frequency as 4μN/Hz1/2 or, as optical power sensitivity, 600W/Hz1/2.

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