Absolute calorimeter for measuring low-energy outputs from CO2 lasers.
This paper describes the construction of a calibrated energy measuring device for pulsed CO(2) lasers of low output energy. An aluminium disk of low thermal capacity has been used for the detection of laser radiation. An Al(2)O(3) layer has been electrolytically deposited on the aluminium disks. It is used as a highly absorbing surface (> 95% for wavelengths between 8.5 and 11.0 microm), thus eliminating the need for calibration. The laser output energy is calculated from the measured increase of temperature of a calorimeter disk of known thermal capacity. Calculations and measurements have shown that this device is capable of measuring the energy of a single pulse of the order of 1 mJ, and in a set of 10 pulses even to 0.1 mJ, for pulses as short as 1 ps.
Jurela
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Boris Kidric Institute of Nuclear Sciences, Laboratory for Atomic Physics, Beograd, Yugoslavia.
Jokić
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