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Longitudinal Mode Spacing

The spacing between multiple frequencies of oscillation within a laser that results from a combination of the gain curve for a laser and the resonance characteristics of its cavity. Since the mode spacing is defined as the speed of light divided by twice the cavity length, short cavities can be used in applications that require a minimal frequency spread. A short cavity can extend the mode spacing such that only one frequency experiences gain during oscillation. 

See also Spatial Mode , Laser

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