Abstract
The saturated 4.3-μm fluorescence frequency stabilization method has been extended to a sequence-band CO2 laser. Owing to little photon trapping, we can detect the 4.3-μm fluorescence with a good signal-to-noise ratio by using a longitudinal CO2 absorption cell heated to 200°C. The frequency stability estimated from the residual error signal is better than 50 kHz.
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