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MULTIMODE OSCILLATION OF THE RUBY LASER NEAR THRESHOLD
1.Research reported in this paper was conducted under United States Air Force Contract No. AF 04(695)‐169.
2.C. L. Tang, H. Statz, and G. deMars, Appl. Phys. Letters 2, 222–4 (1963).
3.C. L. Tang, H. Statz, and G. deMars, J. Appl. Phys. 34, 2289–96 (1963).
4.A. J. DeMaria and R. Gagosz [Appl. Opt. 2, 807–10 (1963)] attribute multimoding and time variations in the output of a ruby laser at room temperature to hole‐burning effects. A large amount of work has been presented [A. L. Schawlow, Advances in Quantum Electronics, ed. J. R. Singer (Columbia University Press, New York, 1961), pp 50–64] which shows that at room temperature the line of ruby is homogeneously broadened. Thus, in the case of ruby at room temperature, the hole‐burning model appears to be untenable.
5.Earlier work of H. Statz and G. deMars, cited in ref 3.
6.M. Birnbaum, T. Stocker, and S. J. Welles, Proc. IEEE 51, 854–5 (1963).
7.The dotted effect, most noticeable on the lower trace of Fig. 1, appears to be inherent in the operation of the Tektronix Dual Beam Oscilloscope Type 545. The same dotting may be observed on noise pulses and, consequently, has no connection with the operation of the laser.
8.When the amplitude of the beat frequency signal is very large, overloading of the receiver occurs, which results in a ringing at the trailing edge of the pulse [Fig. 1 (a), (b), (f), (g)].
9.C. M. Stickley, Appl. Opt. 2, 855–60 (1963).
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