title: High-intensity infrared power measurements by double-resonance phosphorescence depletion in biacetyl vapor.
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 microm, and extension to additional infrared wavelengths is discussed.
authors.forename: M G
authors.initials: MG
authors.lastname: Allen
authors.forename: W J
authors.initials: WJ
authors.lastname: Marinelli