Multiple reflectors as narrow-band and broadband vacuum ultraviolet filters

Zukic, Muamer; Torr, D. G.

doi:10.1364/ao.31.001588

Cited by 30 publications

(20 citation statements)

References 17 publications

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“…Compared to other UV-instruments where spectral selection is achieved with gratings [5][6], the challenge of the development of such instrument lies mainly on the performances of the coating deposition on the optical mirror surfaces. The -multilayer technology [7][8] seems to be the most promising technology to realize such challenge. -multilayer is defined as a periodic structure along the depth of the coating.…”

Section: Coating Optical Designmentioning

confidence: 99%

Development of VUV multilayer coatings for SMILE-UVI instrument

Loicq

Fleury-Frenette

Blain

et al. 2019

International Conference on Space Optics — ICSO 2018

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The Ultraviolet Imager (UVI) instrument is a very challenging imager developed in the frame of the SMILE-ESA mission. The UV camera will consist of a single imaging system targeted at a portion of the Lyman-Birge-Hopfield (LBH) N2 wavelength band. The baseline design of the imager meets the requirements to record snapshots of auroral dynamics with sufficient spatial resolution to measure cusp processes (100 km) under fully sunlit conditions from the specified apogee of the spacecraft. To achieve this goal, the UVI instrument utilizes a combination of four on-axis mirrors with an intensified FUV CMOS based camera. The mirrors will be coated with spectral selective interferometric layers to provide most of the signal filtering. The objective of these filters is to select the scientific waveband between 160 and 180 nm. The combined four mirrors have to give an out-of-band rejection ratio as high as possible to reject light from solar diffusion, dayglow and unwanted atomic lines in a range of 10-8 -10-9. Different multilayer coatings are considered and optimized according to the πmultilayer equation for different H/L ratio and for different angles of incidence. Our theoretical evaluation shows a least a modification of the reflectance spectrum as a function of the angle of incidence, so that the optical beams hitting the different mirrors can have different optical properties depending on the optical fields and the distribution of the rays on the pupil. In this paper the effect of fields and coating homogeneity on the spectral throughput of the UVI instrument will be assessed and described.

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Section: Coating Optical Designmentioning

confidence: 99%

Development of VUV multilayer coatings for SMILE-UVI instrument

Loicq

Fleury-Frenette

Blain

et al. 2019

International Conference on Space Optics — ICSO 2018

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“…Most of the previous work by Zukic and collaborators ( [2], [3], [4J, [5]) was carried out at the Center for Space Plasma and Aeronomic Research at the University of Alabama, Huntsville. Most of the previous work by Zukic and collaborators ( [2], [3], [4J, [5]) was carried out at the Center for Space Plasma and Aeronomic Research at the University of Alabama, Huntsville.…”

Section: Experimental Workmentioning

confidence: 99%

<title>Progress in the development of far-ultraviolet etalons</title>

Bruner

Wüelser

Zukic

et al. 1997

Grazing Incidence and Multilayer X-Ray Optical Systems

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We report on a continuing program to develop and test reflecting coatings suitable for use in Fabry-Perot etalons operating in the far ultraviolet region of the spectrum. UV etalons are of particular interest for solar studies as they have the potential to enable one to make wide-field high resolution diagnostic images such as spectroheliograms, dopplergrams, and density maps in isolated spectral lines formed in the upper chromosphere, transition region and lower corona. The performance of the high-efficiency coatings required by a UV etalon is limited both by the availability of suitable materials, and by the uniformity and accuracy of the deposition process. The lack of UV transmitting materials with a wide range of refractive index is especially troublesome. The latter problem may be partially overcome by using a vacuumspaced etalon design. A vacuum-spaced etalon with cultured quartz plates was successfully operated at 160 nm in a previous study. In this study, we investigated a family of coating designs based on the fluoride salts of magnesium and lanthanum, finding that usable etalon performance may be achievable at wavelengths as short as 120 nm. Results of theoretical predictions and the performance of test coatings will be presented.

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“…The final filters utilize a combination of three reflectors and one transmission filter in series. 5 The reflective component provides both filtering and superb long-wavelength rejection, whereas the transmission filter acts as a low-wavelength cut-on filter. An additional component of the overall filtering process is the use of a "solar blind" CsI photocathode.…”

Section: Optical Systemmentioning

confidence: 99%