Abstract

We report absolute frequency measurements of molecular iodine P(46) 5-4 a1, a10, and a15 hyperfine transitions at 647 nm with a fiber-based frequency comb. The light source is based on a Littrow-type external-cavity diode laser. A frequency stability of 5×1012 at a 200 s integration time is achieved when the light source is stabilized to the P(46) 5-4 a15 line. The pressure shift is determined to be 8.3(7)  kHz/Pa. Our determination of the line centers reached a precision of 21 kHz. The light source can serve as a reference laser for lithium spectroscopy (2S3P).

© 2018 Optical Society of America

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