Abstract
A thin platinum film wattmeter for measurements of instantaneous power output from a pulsed CO2 laser is presented. Its design, operating characteristics, calibration, and use in the experimental investigation are described. The time response of this gauge is shorter than 1 μsec. The response of this gauge is linear for exposure duration of up to about 20 msec and up to total laser energy of about 100 J. The thin film wattmeter was used for measurements of the power output obtained in CO2 gasdynamic laser experiments in a shock tunnel. The laser radiation measurements of the thin film gauge are compared to those obtained with gold-doped germanium detector. The absolute power output values obtained from the calibrated thin film wattmeter are in agreement with theoretical calculations.
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