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FAR‐INFRARED CONTINUOUS‐WAVE LASER OSCILLATION IN PURE HELIUM
1.This letter is primarily concerned with laser oscillation in isotopic species. Oscillation has also been obtained at the 95.8‐μ transition in the isotope.
2.D. E. McCumber, Bell System Tech. J., 333 (1965).
3.A. Javan, in Quantum Electronics, C. H. Townes, Ed. (Columbia University Press, New York, 1960).
4.R. G. Fowler, F. M. Holzberlein, C. H. Jocobson, and S. J. B. Corrigan, Proc. Phys. Soc. (London) 84, 539 (1964).
5.A. H. Gabriel and D. W. O. Heddle, Proc. Roy. Soc. (London) A258, 124 (1960).
6.S. C. Brown, Basic Data of Plasma Physics (Technology Press, Cambridge, Massachusetts, 1959).
7.For instance, at a pressure of 0.1 Torr and tube current of 10 A, the rate of excitation to and are and respectively.
8.The line shape is Lorentzian and its half‐width is with T defined in the text.
9.L. E. S. Mathias, A. Crocker, M. S. Wills, IEEE J. Quantum Electron. (1967).
10.See, for instance, L. O. Hocker, J. G. Small, and A. Javan, Physics Letters (to be published).
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