Surface characterization of SiC mirrors exposed to fast atomic oxygen

Raikar, Ganesh N.; Gregory, J. C.; Partlow, W. D.; Herzig, H.; Choyke, W. J.

doi:10.1002/sia.740230206

Cited by 16 publications

(4 citation statements)

References 14 publications

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“…Degradation was attributed to surface oxidation to SiO2. The effect of AO on CVD-SiC EUV-FUV reflectance and the synergic effect of AO along with UV radiation on the CVD-SiC near-UV reflectance were reported by G. Raikar et al [51] and S. Mileti et al [52], respectively. The loss in performance does not exclude the use of CVD-SiC for missions where oxygen in not present.…”

Section: Atomic Oxygenmentioning

confidence: 75%

Mirrors for Space Telescopes: Degradation Issues

Garoli¹,

Marcos²,

Larruquert³

et al. 2020

Preprint

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Mirrors are a subset of optical components essential for the success of current and future space missions. Most of the telescopes for space programs ranging from Earth Observation to Astrophysics and covering the whole electromagnetic spectrum from X-rays to Far-Infrared are based on reflective optics. Mirrors operate in diverse and harsh environments that range from Low-Earth Orbit, to interplanetary orbits and the deep space. The operational life of space observatories spans from minutes (sounding rockets) to decades (large observatories), and the performance of the mirrors within the mission lifetime is susceptible to degrade, which results in a drop of the instrument throughput, which in turn affects the scientific return. Therefore, the knowledge of potential degradation mechanisms, how they affect mirror performance, and how to prevent them is of paramount importance to ensure the long-term success of space telescopes. In this review we report an overview on current mirror technology for space missions with a focus on the importance of degradation and radiation resistance of the coating materials. A special attention will be given to degradation effects on mirrors for the far and extreme UV as in these ranges the degradation is enhanced by the strong absorption of most contaminants.

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Section: Atomic Oxygenmentioning

confidence: 75%

Mirrors for Space Telescopes: Degradation Issues

Garoli¹,

Marcos²,

Larruquert³

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…Degradation was attributed to surface oxidation to SiO 2 . The effect of AO on the CVD-SiC EUV-FUV reflectance and the synergic effect of AO along with UV radiation on the CVD-SiC near-UV reflectance were reported by G. Raikar et al [51] and S. Mileti et al [52], respectively. The loss in performance does not exclude the use of CVD-SiC for missions where oxygen is not present.…”

Section: Atomic Oxygenmentioning

confidence: 76%

Mirrors for Space Telescopes: Degradation Issues

et al. 2020

View full text Add to dashboard Cite

Mirrors are a subset of optical components essential for the success of current and future space missions. Most of the telescopes for space programs ranging from earth observation to astrophysics and covering the whole electromagnetic spectrum from x-rays to far-infrared are based on reflective optics. Mirrors operate in diverse and harsh environments that range from low-earth orbit to interplanetary orbits and deep space. The operational life of space observatories spans from minutes (sounding rockets) to decades (large observatories), and the performance of the mirrors within the mission lifetime is susceptible to degrading, resulting in a drop in the instrument throughput, which in turn affects the scientific return. Therefore, the knowledge of potential degradation mechanisms, how they affect mirror performance, and how to prevent them is of paramount importance to ensure the long-term success of space telescopes. In this review, we report an overview of current mirror technology for space missions with a focus on the importance of the degradation and radiation resistance of coating materials. Special attention is given to degradation effects on mirrors for far and extreme UV, as in these ranges the degradation is enhanced by the strong absorption of most contaminants.

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“…From the XPS studies, the thickness (x) of the layer of surface components can be estimated according to the relative intensities ratio algorithm 3,8,10,12,17 …”

Section: Resultsmentioning

confidence: 99%

“…The growth of a silica layer at the surface was observed after thermal oxidation in oxygen, 6,7,8,10,12,13 ozone 8 and air. 8,9,11 The existence of some intermediate species such as SiO x C y at the interface between SiC and SiO 2 layers 7,11,13 14 showed that SiO x C y assumes an SiC-like structure when x < y and an SiO 2 -like structure when x > y.…”

Section: Introductionmentioning

confidence: 96%

Oxidation of the silicon carbide surface in Watts' plating bath

Socha¹,

Laajalehto²,

Nowak³

2002

Surface & Interface Analysis

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An important problem in metal-matrix composite production by electrochemical co-deposition of SiC particles with nickel is the large variation of the SiC concentration in the composite. One of the possible reasons is the change of SiC surface properties due to its oxidation during contact with the plating bath. X-ray photoelectron spectroscopy was applied to study the surface oxidation of the [0001] basal plane of a-SiC crystals contacted with Watts' plating bath at 55• C. It was shown that the growth of silica at the surface is preceded by the formation of a silicon oxycarbide species (SiO x C y ). The formation of graphite-type carbon at the surface was also observed. The equivalent layer thickness of the main species at the oxidized surface was calculated.

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Surface characterization of SiC mirrors exposed to fast atomic oxygen

Cited by 16 publications

References 14 publications

Mirrors for Space Telescopes: Degradation Issues

Mirrors for Space Telescopes: Degradation Issues

Mirrors for Space Telescopes: Degradation Issues

Oxidation of the silicon carbide surface in Watts' plating bath

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