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HYSTERESIS IN AN He‐Ne LASER
1.W. E. Lamb, Jr., Phys. Rev 134, A1429 (1964).
2.R. L. Fork and M. Sargent III, Phys. Rev 139, A617 (1965). Although the theory given in this reference leads one to expect the three crossovers, it does not predict strong coupling and hysteresis. We suggest that collision‐induced transitions between magnetic sublevels are the most probable cause of the increased coupling.
3.R. L. Fork and M. Sargent III, Proceedings of the 1965 Physics of Quantum Electronics Conference McGraw‐Hill, to be published.
4.R. L. Fork and M. A. Pollack, Phys. Rev. 139, A1408 (1965).
5.I. Tobias, M. L. Sholnick, R. A. Wallace, and T. G. Polanyi, Appl. Phys. Letters 6, 198 (1965).
6.Since this crossover occurs at a point in the resonator tuning rather than over a finite range, it appears to be more relevant to speak of the time required for the maser to switch modes; however, one should note that this time can depend on the tuning rate.
7.One possible explanation of the marked asymmetry in Fig. 2c is that in reversing the magnetic field, and consequently interchanging the association of a given polarization with the higher frequency mode, the two biases on the mode competition, which are assumed to have arisen from collision‐induced asymmetry and the population differences between sublevels, both aided the same mode (solid curve), whereas in Figs. 2a and 2b the two biases worked against each other producing a more symmetric trace.
8.Hysteresis phenomena have apparently been observed independently by Culshaw and Kannelaud [Phys. Rev 141, 237 (1966)] in a maser operating on the neon transition at 1.15 μ however, they do not seem to have associated this with strong coupling or to have identified the hysteresis regions.
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