Cavity-enhanced spectra of hot Rydberg atoms

High-precision spectra of Rydberg atoms are significance in studying the interaction between atoms, energy level structure atom, and precision measurement electromagnetic field. To enhance sensitivity, it is necessary to achieve high contrast, signal-to-noise ratio, narrow linewidth atoms. In this work, cavity-enhanced studied theoretically experimentally. Comparing with free-space contrast ratio enhanced by 11.5 times, unchanged. Under condition two-photon resonance, both electro-magnetically induced transparency double-resonance optical-pumping process can suppress absorption probe laser, thereby improving impedance matching cavity. As intracavity laser intensity turns stronger, be improved further, improvement depends on transmission through atom vapor. It expected that a factor 23 optimizing temperature cesium This work provides an important reference for sensitivity Rydberg-based measurements.