Observation of intracavity electromagnetically induced transparency and polariton resonances in a doppler-broadened medium

The transmission spectrum of three-level atoms in a vapor cell inside an optical cavity shows distinct peaks associated with atom-cavity polaritons in the system. We develop the theory of these resonances in a Doppler-broadened medium and present the results of experimental observations of these spectra in three-level Λ-type rubidium atoms inside an optical ring cavity.