Zeeman discharge tube frequency monitor.
A discriminant to frequency stabilize a gas laser has been obtained from a discharge tube in which the gain profile is split by an ac magnetic field. By superimposing a do magnetic field, the discriminant can be centered at any point on the gain profile. By employing feedback techniques, the center of the discriminant can be used to track a laser frequency; the magnitude of the do magnetic field determines the displacement of the laser frequency from the gain maximum.
Aronowitz
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Systems and Research Center,Honeywell, Inc., Minneapolis, Minnesota 55113, USA.
Gustafson
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Killpatrick
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