Photonics Dictionary

Fabry-Perot method

A means of determining a prism's index of refraction by placing the prism so that its emergent face is perpendicular to the incident beam. This arrangement permits the determination of the prism's angle and the beam's angle of deviation, which then can be used to calculate the index of refraction. This method is particularly useful when determining the prism's index of refraction using an ultraviolet or infrared source, since the prism may be placed in alignment using a visible source replaced in turn by the UV or IR source.
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