For this spectral analysis, Saint-Gobain Crystals supplies two key components:
A monochromating crystal is used to disperse the various spectral components of the beam emitted by sample. A detector is used to measure intensity of spectral lines singled out by the monochromator.
Monochromating crystals can be supplied in the two following shapes:
Flat crystals can be supplied unmounted or mounted onto holders. Saint-Gobain can provide standard or custom holders. The curved crystals used in instruments such as microprobes, scanning electron microscopes, Synchrotrons, XFEL, Plasma Physics are always supplied on tailor-made holders.
Two main types of focusing configurations may be considered:
The Johann Geometry (semi-focusing)
A thin plate is produced by one of the two following methods:
The thin plate is then curved cylindrically and glued to a curved holder with approximate focusing.
The Johansson Geometry (exact focusing geometry)
Two different types of Johansson configurations, theoretically leading to perfect focusing, are considered:
The thin plate is either curved cylindrically, glued to a curved holder and one face is machined (single machining Johansson) or both faces are machined and then glued to a curved holder (double machining Johansson).
Saint-Gobain Crystals will choose the most appropriate technique according to the type of crystal, its dimensions and the radius of Rowland circle to be achieved.
Other types of curvature may be investigated on request. Following designs can be made:
Manufacturing capabilities strongly depend upon the crystal nature, dimensions as well as the curvature radii.