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The measurement of far-infrared laser gain and loss using a Michelson coupler

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2 Author(s)
Woskoboinikow, P. ; Massachusetts Institute of Technology, Cambridge, MA, USA ; Jennings, W.C.

It is demonstrated that small values of small-signal gain and total internal losses in far-infrared lasers can, in principle, be determined by measuring the optimum and threshold output coupling coefficients with a Michelson coupler. Experimental results show that although accurate determination of the small-signal gain can be made, only a good approximation of the internal losses is obtained by this method. The gain of the 220-μm transition of H2O is shown to increase from 0.24 percent m-1to 0.43 percent m-1with the addition of helium to 0.25 tort H2O at a discharge current of 1.8 A.

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Quantum Electronics, IEEE Journal of  (Volume:12 ,  Issue: 10 )