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Schematic of the experimental setup of the coupled three-level atoms-cavity system. : quarter-wave plate; D1, D2: detectors; HV-AMP: high voltage amplifier; PZT: piezoelectric transducer; PBS: polarized beam splitter; : optical lens; F–P: Febry–Perot cavity. Bottom: relevant energy levels and field configurations. is the frequency of the single pump field.
(a) The saturated absorption spectrum is shown for the frequency reference of the pump light. (b) The weak-field cavity transmission spectrum with atoms inside the cavity (red line). The empty cavity transmission spectrum without atoms (green line).
The scanned F–P cavity transmission spectra. (a), (b), and (c) show the generated Stokes and anti-Stokes fields when the pump frequency is set at different positions a, b, and c, respectively, as indicated in Fig. 2(a). The temperature of the vapor cell is set at .
The measured threshold behavior of the emitted anti-Stokes light in Fig. 3(b) as a function the pump beam power. The temperature of the Rb cell is .
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