Abstract
A frequency-doubled 1.064 μm Nd:YAG MISER has recently been stabilized to iodine near 532 nm.1,2 By using the Doppler-free spectroscopic technique of modulation transfer3 excellent frequency stability was obtained (frequency reproducibility and Allan variance at 1 s integration time <2 × 10−13), so this system could serve as an accurate secondary frequency standard. In this paper the frequencies of several transitions in molecular iodine suitable for stabilization of a doubled Nd:YAG MISER are measured absolutely. The principle of the measurement is based on the fact that the sum frequency of the Rb two-photon line at 778.19521 nm and the iodine stabilized 532 nm from doubled Nd:YAG is “only” 1277 GHz larger than the doubled frequency of an iodine stabilized He–Ne laser at 633 nm.
© 1994 Optical Society of America
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