Atomic spontaneous emission can be enhanced in a lossy cavity due to the bi-orthogonality of resonance modes. This phenomenon is known as the Petermann effect. If the cavity is non-regular, coupling arises between cavity modes. As a result, two interacting modes coalesce to a single mode at an exceptional point in the parameter space. Here, we first present our recent quantum calculation based on quasi-modes quantization for a deformed microcavity that the spontaneous emission rate into a lasing mode near an exceptional point is enhanced by the Petermann factor, which diverges at the exceptional point. We then present our preliminary data obtained in a liquid-jet deformed microcavity to show significantly enhanced spontaneous emission near an exceptional point. Our results can be utilized in increasing lasing efficiency in deformed microcavity lasers.
展开▼
