Abstract

A novel technique for power measurements in high-intensity infrared beams has been developed. A pulse of 443-nm laser radiation prepares an excited state of biacetyl vapor seeded into an atmosphere of nitrogen. This state phosphoresces with a quantum yield of 0.15. A high-intensity infrared beam is partially absorbed by the excited state, which depletes the phosphorescence. Monitoring of this depletion permits a measurement of the infrared intensity with a temporal resolution of less than 1 msec. The technique is demonstrated at 1.06 μm, and extension to additional infrared wavelengths is discussed.

© 1988 Optical Society of America

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