Abstract
Stark and Zeeman effects in the 3.39 µm methane line are known to be very small. Other kinds of frequency shifts with the laser power, temperature and pressure of the gas are investigated. The second-order Doppler effect, the recoil effect, the optical Stark effect and the pressure shift are considered. These shifts in linear absorption in an external cell and in saturated absorption in an internal cell are evaluated. A recent study of the effect of magnetic hyperfine structure in saturated absorption is found to exhibit a large frequency shift which depends on the laser power and the gas pressure. The pressure shift is larger in linear absorption, while other types of shifts are larger in saturated absorption. The stabilization by linear absorption in an external cell is thus expected to be a better standard of infrared frequency and wavelength with an accuracy of the order of 10-14 to 10-15.
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