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 D2 line of  87Rb, the frequency of which is known with 10-kHz accuracy. We have used this method to measure the hyperfine structure in the 5P3/2 state of  85Rb. We obtain precise values for the hyperfine constants, A=25.0416 MHz and B=26.01325 MHz, and a value of 77.992(20) MHz for the isotope shift in the D2 line.

© 2003 Optical Society of America

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