Proceedings PaperInfrared High-Speed Fabry-Perot Interferometer For Rapid-Scan Laser Spectroscopy Measurements
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A high-speed scanning Fabry-Perot interferometer (FPI) has been developed to provide time-resolved spectral data on a pulsed iodine laser operating at 1.3152 Am. The instrument consists of a Fabry-Perot etalon operating in the bull's-eye (Haidinger) fringe mode, combined with transfer optics and a polygon scan mirror for streaking a slit image containing the Fabry-Perot spectrum onto a lead sulfide vidicon camera. The FPI is adjusted for a free spectral range of 0.250 nm in order to detect any or all of the six possible iodine transitions. Spectra with pulse lengths as long as 50 μs can be measured to a resolution better than 500 ns. The instrument is coupled to a personal computer based video frame grabber for data acquisition and analysis.