Sodium Doublet on Fabry-PerotThe image below shows the appearance of the interference fringes of the sodium doublet produced by Fabry-Perot optics. This is the appearance at one position. As the micrometer is adjusted to increase the mirror spacing, the appearance changes as the fringes merge together.
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Index Interference concepts Example of sodium doublet | ||||||
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Fabry-Perot CalculationA high-resolution interferometer, the Fabry-Perot has a resolvance of |
Index Interference concepts | ||
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Fabry-Perot ResolutionA high-resolution interferometer, the Fabry-Perot 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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