FabryPerot Interferometer

Index Interference concepts Example of sodium doublet  

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FabryPerot GeometryThe FabryPerot Interferometer makes use of multiple reflections which follow the interference condition for thin films. The net phase change is zero for two adjacent rays, so the condition represents an intensity maximum. 
Index Interference concepts  

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FabryPerot ResolutionA highresolution interferometer, the FabryPerot Interferometer has a resolvance of which means that the least separation of two spectral lines is given by
This separation means that the two wavelengths satisfy the Rayleigh criterion. The interferometer can also be characterized by its free spectral range, the change in wavelength necessary to shift the fringe system by one fringe: 
Index Interference concepts  

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