Mode volume may refer to figures of merit used either to characterise optical and microwave cavities or optical fibers. == In electromagnetic cavities == The mode volume (or modal volume) of an optical or microwave cavity is a measure of how concentrated the electromagnetic energy of a single cavity mode is in space, expressed as an effective volume in which most of the energy associated with an electromagentic mode is confined.
Mode volume may refer to figures of merit used either to characterise optical and microwave cavities or optical fibers. == In electromagnetic cavities == The mode volume (or modal volume) of an optical or microwave cavity is a measure of how concentrated the electromagnetic energy of a single cavity mode is in space, expressed as an effective volume in which most of the energy associated with an electromagentic mode is confined.
Source: Wikipedia "Mode volume" · CC BY-SA 4.0
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