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A new method of measuring CO(2) laser power by an optical fiber interferometer (calorimeter) is described. The linearity of the phase change vs the irradiated power of the CO(2) laser was observed. The sensitivity was found experimentally to be 0.33 pirad/mW. The response time was almost independent of the CO(2) laser power.
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Hirose et al. (1987) studied this question.
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