For orbiting astronomical telescopes and rocket spectroscopy the great angular dispersion of the Fabry-Perot interferometer should permit easier guidance tolerance for a given spectral resolving power with the added profit of the physical compactness of an etalon spectrometer or spectrograph. Moreover the superiority in luminosity and illumination of the interferometer instruments would permit shorter exposures and greater time resolution. Work aimed at extending the spectral range of the interferometer for high resolution work on the solar Frauenhofer spectrum (3 000 A-1 800 A) from stabilized rockets is reviewed. The first
The factors affecting the performance of Fabry-Perot interferometers in the middle and vacuum ultraviolet are considered. Improvement of performance in the middle ultraviolet to 2000Å and extension of the useful spectral domain of the instrument into the vacuum ultraviolet are reported.
The preparation and optical properties for ultraviolet multiple beam interferometry of double layer aluminium-magnesium fluoride semi-transparent reflecting coatings are discussed. Fabry-Perot type Al–MgF2 interference filters for these spectral regions are also described and an interferogram of λ 1849 of HgI obtained with an ultraviolet sensitive image converter is illustrated. Applications of these techniques to space research and to laser and plasma spectroscopy are mentioned.
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