WIDE-BAND TUNABLE DIODE LASER HETERODYNE MEASUREMENTS

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1980

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Ohio State University

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A technique for rapid, accurate, and copious diode laser heterodyne measurements of infrared absorption frequencies will be discussed in $detail.^{1}$ By use of a wideband (3 dB width, 1.2 GHz) HgCdTe photomixer and a $CO_{2}$ laser local oscillator, absorptions lying within 9 GHz of a $CO_{2}$ emission line may be measured with care to within 6 MHz. The data from accurate infrared heterodyne measurements of 1,1-difluoroethylene, when supplemented with existing microwave data on the ground state, permit the calculation of submilimeter wave laser emission frequencies to within a few megahertz. Similar measurements on carbonyl sulfide increase its utility as a secondary frequency standard.

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$^{1}$ J. P. Sattler, T. L. Worchesky, K. J. Ritter, and W. J. Lafferty, Opt. Lett. 5, 21 (1980)
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