Interference filters for the far ultraviolet (1700 A to 2400 A).
The transmission characteristics of Fabry-Perot type aluminum-magnesium fluoride-aluminum interference filters for the wavelength region 1700 A to 2400 A are described. Typical peak transmissions of 0.25 with bandpasses <300 A are obtained with first-order filters on fused silica substrates. Secondorder filters give narrower bandpasses. Methods of filter preparation are described briefly, and the effects of the optical properties of the aluminum reflecting layers on filter performance are discussed.
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Physics Department, Imperial College,London.
Bradley
D J
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