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Interference filters for the far ultraviolet (1700 A to 2400 A)
1Physics Department, Imperial College,London.
Applied Optics
|January 6, 2010
Summary
This study details Fabry-Perot interference filters for the 1700-2400 Å range. Aluminum-magnesium fluoride-aluminum filters achieve peak transmissions of 0.25 with narrow bandpasses, suitable for UV applications.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Fabry-Perot interference filters are crucial optical components.
- Understanding their performance in the ultraviolet (UV) spectrum is essential for various applications.
Purpose of the Study:
- To characterize the transmission properties of Fabry-Perot type aluminum-magnesium fluoride-aluminum interference filters.
- To investigate filter performance in the 1700 Å to 2400 Å wavelength region.
Main Methods:
- Fabrication of first- and second-order interference filters using aluminum-magnesium fluoride-aluminum layers.
- Utilizing fused silica substrates for filter construction.
- Analysis of transmission characteristics, including peak transmission and bandpass width.
Main Results:
- First-order filters on fused silica substrates achieved typical peak transmissions of 0.25 with bandpasses less than 300 Å.
- Second-order filters demonstrated narrower bandpasses compared to first-order filters.
- The optical properties of the aluminum reflecting layers significantly influence overall filter performance.
Conclusions:
- Fabry-Perot filters utilizing aluminum-magnesium fluoride-aluminum layers are effective for the 1700-2400 Å spectral region.
- Filter order and the properties of reflecting layers are key parameters for optimizing UV filter performance.
- The described filters offer potential for applications requiring narrow-band UV light transmission.
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