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An optical cavity, also known as an optical resonator, is a structure that confines light by reflecting it between two or more mirrors. The primary purpose of an optical cavity is to enhance the interaction between light and matter, which can be crucial for applications such as lasers, sensors, and other photonic devices. ### Key Components: 1. **Mirrors**: Optical cavities typically consist of at least two mirrors, which can be planoconvex, concave, or a combination.