![]() The same technique is used for many laser diodes here, the Fresnel reflectivity is substantially larger due to the high refractive index of the semiconductor material. For some fiber lasers, the Fresnel reflection at a fiber end is used for closing the laser resonator.Įffectively, such a fiber end serves as an output coupler with a reflectivity of typically somewhat below 4%.The dashed line shows the reflectivity of a single fiber–air interface. for close to zero width) or get enhanced by constructive interference. ![]() The reflectivity can vanish due to destructive interference (e.g.
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