An optical cavity supports optical fields whose phases and spatial profiles reproduce themselves after a round trip through its reflecting or guiding elements. Its resonance conditions include propagation and reflection phases. A cavity bounded by two plane mirrors is a simple example; Fabry–Pérot resonance spacing describes the frequency intervals of an ideal two-mirror arrangement.
A Lorentz transformation of a resonant optical cavity transforms both the electromagnetic field and the mirror worldlines. Boundary conditions and event-by-event phase matching remain satisfied. For a longitudinal boost, a cavity of rest length has length and unequal forward/backward frequencies . The coordinate round-trip time is , while the phase rate on a moving mirror is , so the round-trip phase is still . A stationary-mirror resonance formula with only length contraction inserted describes the wrong boundary-value problem.
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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.
