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Gain saturation of CW laser pumped FIR laser gases

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2 Author(s)
J. Heppner ; Universität Stuttgart, Stuttgart, Germany ; U. Hubner

The saturation behavior of the 70 μm and the 119 μm transitions in CH3OH has been investigated both experimentally and theoretically. This knowledge is essential for constructing a complete model of the CW laser pumped FIR laser. Saturated gain measurements made in a single pass amplifier cell were found to be in good agreement with the theory of a quantum-mechanical three-level system in resonant interaction with two coherent fields. The calculation of the gain using the density matrix formalism yields a pump intensity dependent saturation, a result which is not predicted by the rate equation models.

Published in:

IEEE Journal of Quantum Electronics  (Volume:16 ,  Issue: 10 )