Abstract

Internal-mirror 543 nm HeNe lasers are frequency-stabilized on the iodine hyperfine transitions. The Allen standard deviation of 1×10 −12 is reached after a 10 second integration time. The hyperfine spectrum originating from the R (12) 26-0 and R (106) 28-0 lines of the B-X system of 127I 2 has been studied. The frequency differences between hyperfine components have been measured by beat frequency techniques, and the hyperfine coupling constants are fitted for the R (106) 28-0 line.

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