Abstract
Multi-normal-mode splitting peaks are experimentally observed in a system with Doppler-broadened two-level atoms inside a relatively long optical cavity. In this system, the atom-cavity interaction can reach the ``superstrong-coupling'' condition with atom-cavity coupling strength $g\sqrt{N}$ to be near or larger than the cavity free-spectral range ${\ensuremath{\Delta}}_{\text{FSR}}$. In such case, normal-mode splitting can occur in many cavity longitudinal modes to generate the multi-normal-mode splitting peaks, which can be well explained by the linear-dispersion enhancement due to the largely increased atomic density in the cavity. Many new interesting phenomena might come out of this superstrong atom-cavity coupling regime.
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