Abstract

The o hyperfine component of the 127I2 17-1 P(62) transition at 520 THz (576 nm) in iodine was measured with respect to the CH4-stabilized 88-THz He–Ne laser. A 26-THz CO2 laser, a color-center laser at 130 THz, and a He–Ne laser at 260 THz were used as transfer oscillators. The measured I2 frequency was 520 206 808.547 MHz with a total fractional uncertainty of 1.6 × 10−10. The 1.15-μm 20Ne Lamb-dip-stabilized laser frequency was 260 103 249.26 MHz with a total fractional uncertainty of 3.1 × 10−10.

© 1983 Optical Society of America

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