Abstract
We demonstrate a technique for frequency measurements of atomic transitions with a precision of 30 kHz. The frequency is measured with a ring-cavity resonator whose length is calibrated against a reference laser locked to the line of , the frequency of which is known with 10-kHz accuracy. We have used this method to measure the hyperfine structure in the state of . We obtain precise values for the hyperfine constants, and , and a value of 77.992(20) MHz for the isotope shift in the line.
© 2003 Optical Society of America
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