Precise frequency measurements of atomic transitions by use of a Rb-stabilized resonator

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 $D_2$ line of ${ }^{87}\mathrm{Rb}$, the frequency of which is known with 10-kHz accuracy. We have used this method to measure the hyperfine structure in the $5P_{3/2}$ state of ${ }^{85}\mathrm{Rb}$. We obtain precise values for the hyperfine constants, $A=25.041\left(6\right) \mathrm{MHz}$ and $B=26.013\left(25\right) \mathrm{MHz}$, and a value of 77.992(20) MHz for the isotope shift in the $D_2$ line.

© 2003 Optical Society of America

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