REFERENCES
1.
W. E. Lamb, Jr. (to be published in Phys. Rev.).
2.
R. J.
Carbone
and P. R.
Longaker
, [Appl. Phys. Letters
4
, 32
(1964
)], using the modulated laser field to excite fluorescence in a sample external to the laser cavity, measured an excited state lifetime in GaAs. In our work, however, the optical transition was saturated, producing pulsations of both upper and lower laser level populations.3.
L. E.
Hargrove
, R. L.
Fork
, and M. A.
Pollack
, Appl. Phys. Letters
5
, 4
(1964
).4.
B. D. Fried and S. D. Conte, The Plasma Dispersion Function (Academic Press Inc., New York, 1961).
5.
The laser tube was filled with and 0.7‐Torr He.
6.
R. L. Fork, L. E. Hargrove, and M. A. Pollack (submitted to Phys. Rev. Letters).
7.
8.
We note that a contribution to the dependence of observed phase shift on observation angle could also arise from fourth and higher order terms in field amplitude.
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© 1964 American Institute of Physics.
1964
American Institute of Physics
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