Multidielectric mirrors for the super-ACO storage-ring free-electron-laser in the UV

David Garzella; Marie-Emmanuelle Couprie; T. Hara; Anne Delboulbe; Michel Billardon

doi:10.1117/12.192094

4 November 1994 Multidielectric mirrors for the super-ACO storage-ring free-electron-laser in the UV

David Garzella, Marie-Emmanuelle Couprie, T. Hara, Anne Delboulbe, Michel Billardon

Proceedings Volume 2253, Optical Interference Coatings; (1994) https://doi.org/10.1117/12.192094
Event: 1994 International Symposium on Optical Interference Coatings, 1994, Grenoble, France

Abstract

Storage ring Free Electron Lasers (FELs) are very promising tunable and powerful laser sources for the UV range. However, the relatively small gain obtained in the UV, requires the use of high reflectivity multidielectric mirrors. In addition, all the synchrotron radiation (not only the first harmonic where the laser operates) emitted by the undulator, consisting of a wide spectrum of the harmonics of the fundamental wavelength extending towards the X rays is received by the front mirror of the laser cavity. These higher harmonics are responsible for the mirror degradation. The reflectivity of the multidielectric mirrors has to remain at a high level even in the presence of synchrotron radiation covering a wide spectral range, leading to specific requirements for FEL optics. The FEL at 350 nm was obtained with Ion Beam Sputtering of Ta₂O5/SiO₂, with super polished substrates. Extension towards shorter wavelength requires to use another type of material such as HfO₂/SiO₂. Substrates and mirrors are characterized in roughness, transmission and total losses. The evolution of the mirror degradation is studied versus the deposition technology. The realization of high reflectivity mirrors submitted to the radiation from the undulator remains a challenging issue for the development of tunable short wavelength FELs.

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David Garzella, Marie-Emmanuelle Couprie, T. Hara, Anne Delboulbe, and Michel Billardon "Multidielectric mirrors for the super-ACO storage-ring free-electron-laser in the UV", Proc. SPIE 2253, Optical Interference Coatings, (4 November 1994); https://doi.org/10.1117/12.192094

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KEYWORDS

Mirrors

Free electron lasers

Ultraviolet radiation

Reflectivity

Sapphire

Silica

Synchrotron radiation

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