Precise Measurement of Hyperfine Structure of Cesium 7<i>S</i>_1/2 Excited State

Abstract

We present a precise measurement of the hyperfine structure of cesium 7 S 1 / 2 excited state by employing electromagnetically induced spectroscopy (EIS) with a cesium three-level cascade ( 6 S 1 / 2 − 6 P 3 / 2 − 7 S 1 / 2 ) atom in a room temperature vapor cell. A probe laser, λ p = 852 nm, was coupled to a transition | 6 S 1 / 2 〉 → | 6 P 3 / 2 〉 , related frequency locked to the resonance hyperfine transition of | 6 S 1 / 2 〉 → | 6 P 3 / 2 〉 with a Fabry−Perot (FP) cavity and an electro-optic modulator (EOM). A coupling laser, λ c = 1470 nm, drove the | 6 P 3 / 2 〉 → | 7 S 1 / 2 〉 transition with the frequency scanned over the | 6 P 3 / 2 〉 → | 7 S 1 / 2 〉 transition line. The hyperfine level interval was extracted to be 2183.61 ± 0.50 MHz by analyzing EIS spectroscopy. The optical−optical double-resonance (OODR) spectroscopy is also presented for comparison, with the corresponding value of the hyperfine level interval being 2183.48 MHz ± 0.04 MHz, and the measured hyperfine splitting of excited 7 S 1 / 2 state is shown to be in excellent agreement with the previous work.

Keywords

• hyperfine structure
• electromagnetically induced spectroscopy
• cesium 7<i>s</i>_1/2 excited state