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Linear cavity optically pumped far-infrared (FIR) lasers have been used extensively for plasma diagnostic measurements. However, recent experiments have suffered from frequency pulling induced by feedback of FIR radiation. The application of a ring cavity to FIR lasers is investigated as a means of improving frequency stability, particularly in the presence of strong feedback. Unidirectional traveling wave laser operation is observed, and so feedback radiation does not interact directly with the dominant cavity mode. The resultant frequency pulling is observed to be minimal (∼5 kHz) in comparison with a linear cavity (Δf∼100 kHz) when a feedback power of Δf∼2% is studied. In addition, the ring laser eliminates the two-photon light shift, and, therefore, significantly (a factor of 10) improves the absolute frequency stability near the absorption line center.
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Lee et al. (1992) studied this question.
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