Details
| Original language | English |
|---|---|
| Title of host publication | Advances in Optical Thin Films |
| Subtitle of host publication | 30 September - 3 October 2003, St. Etienne, France |
| Place of Publication | Bellingham |
| Publisher | SPIE |
| Pages | 146-157 |
| Number of pages | 12 |
| ISBN (print) | 0-8194-5134-7 |
| Publication status | Published - 25 Feb 2004 |
| Externally published | Yes |
| Event | Advances in Optical Thin Films - St. Etienne, France Duration: 30 Sept 2003 → 3 Oct 2003 |
Publication series
| Name | Proceedings of SPIE - The International Society for Optical Engineering |
|---|---|
| Publisher | SPIE |
| Volume | 5250 |
| ISSN (Print) | 0277-786X |
Abstract
Optical coatings for the use in free electron laser systems have to withstand high power laser radiation and the intense energetic background radiation of the synchrotron radiation source. In general, the bombardment with high energetic photons leads to irreversible changes and a discoloration of the specimen. For the development of appropriate optical coatings, the degradation mechanisms of available optical materials have to be characterized. In this contribution the degradation mechanisms of single layer coatings (fluoride and oxide materials) and multilayer systems will be presented. Fluoride and oxide single layers were produced by thermal evaporation and high energetic ion beam sputter deposition. The same methods were employed for the deposition of multilayer systems. High reflecting coatings for the wavelength region around 180nm were chosen for the irradiation tests. All samples were characterized after production by spectrophotometry covering the VUV, VIS, and MIR spectral range. Mechanical coating stress was evaluated with interferometric methods. Synchrotron irradiation tests were performed at ELETTRA, using a standardized irradiation cycle for all tests. Ambient pressure and possible contamination in the vacuum environment were monitored by mass spectrometry. For comparison, the optical coatings were investigated again in the VUV, VIS, and MIR spectral range after irradiation. On selected samples XRD measurements were performed. The observed degradation mechanisms comprise severe damages like coating and substrate surface ablation. Color centre formation in the VIS spectral range and an increase of VUV absorption were found as a major origin for a severe degradation of VUV transmittance On the basis of the performed investigations, a selection of coating materials and coating systems is possible in respect to the damage effects caused by synchrotron radiation.
Keywords
- Optics characterization, Radiation resistance, Synchrotron radiation, VUV coatings
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Condensed Matter Physics
- Computer Science(all)
- Computer Science Applications
- Mathematics(all)
- Applied Mathematics
- Engineering(all)
- Electrical and Electronic Engineering
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Advances in Optical Thin Films: 30 September - 3 October 2003, St. Etienne, France. Bellingham: SPIE, 2004. p. 146-157 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 5250).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Radiation resistance of single and multilayer coatings against synchrotron radiation
AU - Günster, Stefan
AU - Blaschke, Holger
AU - Ristau, Detlev
AU - Danailov, Miltcho Boyanov
AU - Trovó, Mauro
AU - Gatto, Alexandre
AU - Kaiser, Norbert
AU - Sarto, Fransesca
AU - Flori, Daniel
AU - Menchini, F.
PY - 2004/2/25
Y1 - 2004/2/25
N2 - Optical coatings for the use in free electron laser systems have to withstand high power laser radiation and the intense energetic background radiation of the synchrotron radiation source. In general, the bombardment with high energetic photons leads to irreversible changes and a discoloration of the specimen. For the development of appropriate optical coatings, the degradation mechanisms of available optical materials have to be characterized. In this contribution the degradation mechanisms of single layer coatings (fluoride and oxide materials) and multilayer systems will be presented. Fluoride and oxide single layers were produced by thermal evaporation and high energetic ion beam sputter deposition. The same methods were employed for the deposition of multilayer systems. High reflecting coatings for the wavelength region around 180nm were chosen for the irradiation tests. All samples were characterized after production by spectrophotometry covering the VUV, VIS, and MIR spectral range. Mechanical coating stress was evaluated with interferometric methods. Synchrotron irradiation tests were performed at ELETTRA, using a standardized irradiation cycle for all tests. Ambient pressure and possible contamination in the vacuum environment were monitored by mass spectrometry. For comparison, the optical coatings were investigated again in the VUV, VIS, and MIR spectral range after irradiation. On selected samples XRD measurements were performed. The observed degradation mechanisms comprise severe damages like coating and substrate surface ablation. Color centre formation in the VIS spectral range and an increase of VUV absorption were found as a major origin for a severe degradation of VUV transmittance On the basis of the performed investigations, a selection of coating materials and coating systems is possible in respect to the damage effects caused by synchrotron radiation.
AB - Optical coatings for the use in free electron laser systems have to withstand high power laser radiation and the intense energetic background radiation of the synchrotron radiation source. In general, the bombardment with high energetic photons leads to irreversible changes and a discoloration of the specimen. For the development of appropriate optical coatings, the degradation mechanisms of available optical materials have to be characterized. In this contribution the degradation mechanisms of single layer coatings (fluoride and oxide materials) and multilayer systems will be presented. Fluoride and oxide single layers were produced by thermal evaporation and high energetic ion beam sputter deposition. The same methods were employed for the deposition of multilayer systems. High reflecting coatings for the wavelength region around 180nm were chosen for the irradiation tests. All samples were characterized after production by spectrophotometry covering the VUV, VIS, and MIR spectral range. Mechanical coating stress was evaluated with interferometric methods. Synchrotron irradiation tests were performed at ELETTRA, using a standardized irradiation cycle for all tests. Ambient pressure and possible contamination in the vacuum environment were monitored by mass spectrometry. For comparison, the optical coatings were investigated again in the VUV, VIS, and MIR spectral range after irradiation. On selected samples XRD measurements were performed. The observed degradation mechanisms comprise severe damages like coating and substrate surface ablation. Color centre formation in the VIS spectral range and an increase of VUV absorption were found as a major origin for a severe degradation of VUV transmittance On the basis of the performed investigations, a selection of coating materials and coating systems is possible in respect to the damage effects caused by synchrotron radiation.
KW - Optics characterization
KW - Radiation resistance
KW - Synchrotron radiation
KW - VUV coatings
UR - http://www.scopus.com/inward/record.url?scp=11144354719&partnerID=8YFLogxK
U2 - 10.1117/12.514801
DO - 10.1117/12.514801
M3 - Conference contribution
AN - SCOPUS:11144354719
SN - 0-8194-5134-7
T3 - Proceedings of SPIE - The International Society for Optical Engineering
SP - 146
EP - 157
BT - Advances in Optical Thin Films
PB - SPIE
CY - Bellingham
T2 - Advances in Optical Thin Films
Y2 - 30 September 2003 through 3 October 2003
ER -