Abstract
We present detailed stability measurements on six He–Ne lasers which have been stabilized by matching the intensity of the two orthogonal polarization modes. The frequencies of five different lasers were closely monitored for 1 month. Another laser was studied for 2 yr. All the lasers exhibited a stability of 1 part in 1010 over the periods of about an hour and better than 1 part in 108 over 1 yr. An absolute accuracy of ~1 part in 109 can be attained by interpolating the linear drift between calibrations performed 6 months to 1 yr apart. These 1-mW lasers are rugged and simple to operate.
© 1988 Optical Society of America
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