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Laser Resonator Modes

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Laser Resonator Modes

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The shape of a laser beam is determined by the resonator cavity, a laser optical mirror, in which the laser light is amplified in a gain medium. Laser resonators are typically formed by using highly reflective dielectric mirrors or a monolithic crystal that utilizes total internal reflection to keep light from escaping. Plane parallel resonator: two flat mirrors separated by a distance equal to an integral multiple of one half of the lasing wavelength, Concentric resonator: two spherical mirrors with the same radius of curvature and coincident centers of curvature, Confocal resonator: two spherical mirrors with the same radius of curvature and coincident focal points.

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