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.
Highlights
With fast development of high-resolution spectroscopy and laser technique, fundamentally important atom-based precise measurements, such as electric field and basic physical constant, are receiving growing attention in the communities of quantum optics, quantum information, and atomic physics
We measured the hyperfine splitting of |7S1/2 i state employing two different methods, electromagnetically induced spectroscopy (EIS) spectroscopy and optical–optical double-resonance (OODR) spectroscopy
electromagnetically induced transparency (EIT) (EIA) is a quantum elimination interference among excitation pathways in the three-level atom that led to a cancellation of absorption in the medium
Summary
With fast development of high-resolution spectroscopy and laser technique, fundamentally important atom-based precise measurements, such as electric field and basic physical constant, are receiving growing attention in the communities of quantum optics, quantum information, and atomic physics. Atom-based metrology has had a tremendous impact on science, technology, and everyday life. Seminal advances include optical atomic clocks [1,2], the Global Positioning System, and highly sensitive, position-resolved magnetometers. Atom-based measurements have clear advantages due to the invariance of atomic properties. Precise measurements of atomic hyperfine structures play an important role in better understanding the atomic structure and its characteristics. Hyperfine structures are caused by the interaction between the nuclear spin and electron angular momentum
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