Precise frequency measurements of atomic transitions using a Rb-stabilized resonator
Ayan Banerjee, Dipankar Das, Vasant Natarajan
Abstract
We demonstrate a technique for frequency measurements of atomic transitions with a precision of 30 kHz. The frequency is measured using 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 to 10 kHz. We have used this to measure the hyperfine structure in the 5P3/2 state of 85Rb. We obtain precise values for the hyperfine constants A=25.041(6) MHz and B=26.013(25) MHz, and a value of 77.992(20) MHz for the isotope shift in the D2 line.
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