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Published February 1970 | Published
Journal Article Open

Axial magnetic field effects on a saturated He-Ne laser amplifier


The behavior of a He-Ne laser amplifier in the presence of an axial magnetic field has been studied experimentally by measuring Faraday rotation and gain for various values of input signal intensity. Two high-gain transitions in the 3.39-μ region were used for study-a J = 1 to J = 2 transition and a J = 1 to J = 1 transition. Theoretical expressions have been developed, which included the nonlinear effects of saturation strength signals. Experimental results clearly show saturation of Faraday rotation; in addition, for the J = 1 to J = 1 transition, a Faraday rotation reversal and a traveling-wave magnetic field dip are seen. These results match the theoretical predictions and provide a method for measuring the upper (3_s_2) level quadrupole moment decay rate.

Additional Information

© 1970 IEEE. Manuscript received June 30, 1969; revised September 8, 1969. The work of R. T. Menzies and N. George was supported in part by the Electronics Division of the Air Force Office of Scientific Research. This paper is based in part on partial fulfillment of the by the Ph.D. degree, California Institute of Technology, Pasadena, Calif., by R. T. Menzies.

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