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Free-running laser stabilities of 1.5×10−11 for the millisecond region and methane-locked stabilities of 10−13 for 10-sec averaging time are achieved with a minimum of shock and vibration isolation in an ordinary laboratory environment. Superior stability performance is obtained with dc excitation as compared to rf excitation. The experimental setup is described in some detail.
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Hellwig et al. (1972) studied this question.
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