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.
© 1992 Optical Society of America
Che-Chung Chou, Jow-Tsong Shy, and Tsu-Chiang Yen, "Saturated 4.3-µm fluorescence frequency stabilization of a sequence-band CO2 laser," Opt. Lett. 17, 967-969 (1992)