An ultra-high-resolution frequency-offset-locked carbon dioxide waveguide laser spectrometer has been constructed. Three different sample cell configurations have been evaluated, namely: plane-plane etalon, mirror-based two-pass cell and a retro-reflector-based two-pass cell. In the last case peak-to-peak linewidths of 12 kHz have been obtained for the first derivative signal in sulphur hexafluoride at 10.6 mu m.
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Padgett et al. (1988) studied this question.
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