Abstract
The far-infrared laser oscillations in water vapor is described theoretically in the form of rate equations in which the molecular rotation-vibration interaction of either Fermi or Coriolis type is taken into account. The theory is developed for the case of pulsed operation of relatively long duration on the assumption that the rotational relaxation time is much shorter than the duration of the excitation pulse. Theoretical expressions for (1) the output power in the steady state as a function of pumping rate and (2) the start-oscillation condition are given. The effects of multi-wavelength oscillations are also obtained and compared with experimental results.
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