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We investigate the transmission spectrum of an optical cavity coupled withfour-level atoms. Multiple normal-mode splitting peaks of the strongly coupledatom-cavity system are obtained as single cavity mode couples three separatedatomic transitions simultaneously. We employ a confocal optical cavity and anensemble of cold Rb-85 atoms for cavity quantum electrodynamics. We observefour normal-mode splitting peaks of the cavity transmission in the strongcoupling regime due to collective enhancement of the atom-cavity couplingstrength by ensemble of cold atoms. The experimental observations areconsistent with the theoretical analysis. The multiple normal-mode excitationin the strongly coupled multi-level atom-cavity system may lead to practicalapplication for realizing multi-channel all-optical devices.

Normal-mode splitting of four-level atom-cavity system under collective strong coupling