- Total reflection optics
- Multilayer optics
- Coated gratings
- Montel optics
Various mirror substrates: 50 cm fused silica, 60 cm Zerodur®
Coating on silicon substrates
Total reflection optics
Total reflection optics are needed at synchrotron beamlines for beam guidance and beam alignment. This type of X-ray optics is used at grazing incidence angles and therefore more and more optics with lengths of 100 cm and more are required.
Bendable 400 mm silicon multilayer optics
The deviation of the desired shape is less than ± 0.2 %.
These optics consist of multilayer films which reflect X-rays using the principle of Bragg diffraction. The single layers, each one only a few nanometers thick, are amorphous. The multilayer may consist of up to several hundred
layers. High reflectivity is obtained when the multilayer materials have a high density contrast and simultaneously a low absorption. The two X-ray optical properties of relevance, i.e. the absorption and dispersion, depend on the X-ray wavelength. Therefore, each wavelength requires its own particular type of multilayer, in order to achieve the best results. To get the optimum optics for a customer specific application we are able to carry out X-ray optical simulations.
Three-striped multilayer optics for tomographic microscopy and coherent radiology, with an optimized coating for different beam energies (TOMCAT at SLS, Switzerland) (Data courtesy of M. Stampanoni)
Synchrotron mirrors for PAL in Korea (Operating energy range 10 – 80 KeV) 300 mm in length
Double crystal multilayer monochromators
At imaging beamlines multilayer optics are often used as double crystal multilayer monochromators (DCMM). For example, in tomography a homogeneous and stable beam profile is required, in order to perform optimal background corrections. Due to the strong coherence of the radiation, particular care must be taken when designing the optics in order to avoid a deterioration in beam quality. Multilayer coatings with up to 5 stripes were produced with films homogeneities below 0.2% as well as with lateral gradients.
The picture left shows a three-striped multilayer optics with an optimized coating for different beam energies.
Gratings coated with SiC for better reflectivity
To enhance the grating efficiency in the spectral range from IR to UV, single layer coatings as Al, Ni, Pt, Cr/Au are in common use. For specific VUV and soft X-ray applications, high density coatings such as carbon or SiC are widely used. Due to our sophisticated deposition technique we are able to offer you these type of coatings with excellent adhesion.
Montel Optics - 100-150 mm in length - with different cross sections from 40 x 40 mm to 10x10 mm
Montel optics for synchrotron beamlines
3rd Generation Montel Optics with slope errors < 2 arcsec are used at Synchrotron beamlines in analyzer systems for inelastic scattering experiments. First optics with this type of small slope errors were sold to NSLS and Diamond for scattering experiments. Montel optics with similar qualities are known from the latest lab-instruments like a Liquid Metal Jet Source.