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Thermal feedback control techniques for transistor–transistor logic triggered CO2 laser used for irradiation of biological tissue utilizing infrared fiber-optic radiometry

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Abstract

A fiber-optic radiometer is used to monitor and control, in real time, the temperature of samples of biological tissue irradiated with a CO2 laser. Several control algorithms are investigated and the optimal control mode is obtained. A silver halide infrared fiber is used both to deliver the CO2 laser radiation needed to irradiate the target and to deliver the thermal radiation emitted from the target back to the radiometer. Such a system can be useful in medical applications of CO2 lasers.

© 1994 Optical Society of America

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