The Fabry-P erot Interferometer - Uni Siegen

The nesse of a Fabry-P erot interferometer can be pushed up to > 200. But to achieve such a result the plates have to be extremely plane and the coating must have a re ection coe cient of nearly one. The alignment must be perfect and the light must be parallel. 3 The Fabry-P erot Interferometer as a Spec-trometer 3.1 General

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