TUNABLE IR LASER WAVELENGTH CALIBRATION USING A MODIFIED LABORATORY FTS INTERFEROMETER
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Date
1979
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Ohio State University
Abstract
Knowledge of the laser wavelength is essential in tunable IR laser spectroscopy. The scanning Michelson interferometer has the potential to compare the IR laser wavelength to a single, well-known calibration wavelength (e.g., HeNe laser) over a wide IR spectral range. In contrast to other recent work with scanning Michelson interferometers, we have added a phase-lock multiplier and counters to a $0.1 Cm^{-1}$ FTS laboratory interferometer to achieve an accuracy of $10^{-3}cm^{-1}$. This Idealab interferometer incorporated cats-eye mirrors, but its other features are probably representative of typical commercial interferometers. Measurements of a stable $CO_{2}$ laser have indicated a precision and calibratable accuracy of $0.001 cm^{-1}$ with $CO_{2}$ use of the HeNe laser monitor supplied with the interferometer. Achievement of the $0.0001 cm^{-1}$ precision and accuracy expected with the phase-lock multiplier is still under study as is the application of the wavemeter to the calibration of tunable diode lasers.
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