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A CO2 laser oscillating on the P(18) transition of the 10. 6-μ band was electronically stabilized without internal modulation to an inverted Lamb dip generated in an extra-cavity SF6 absorption cell. Laser modulation was avoided by employing an external moving mirror to Doppler jitter the light entering the absorption cell. The resultant stabilization point was shown to be independent of laser characteristics. The frequency stability so achieved was 1 part in 109 over a 15-min period.
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Goldberg et al. (1971) studied this question.
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