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Precise frequency measurements of iodine hyperfine transitions at 671 nm

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Abstract

We report absolute frequency measurements on the a1, a10, and a15 hyperfine components of the R(78) 4–6 line of I2127. An external-cavity diode laser system at 671 nm is frequency-stabilized to the saturated absorption center obtained by modulation transfer spectroscopy in an iodine vapor cell. Its absolute frequency is measured by an optical frequency comb. The effect of pressure shift is investigated to obtain the absolute transition frequency at zero pressure. Our determination of the line centers reaches a precision of better than 40 kHz and will provide useful input for theoretical calculations. This frequency-stabilized laser can be used as a reference laser for the spectroscopy of lithium D lines.

© 2013 Optical Society of America

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