High Precision X-ray Mirrors
pecuriality of our x-ray mirrors
- An EEM polished mirror has shape error in nano meter level to the target shape so that it has superior focusing performance compare to other focusing methods and it enables to focus to the diffraction limit.
- Our X-ray mirror has an excellent focus efficiency since the mirror surface has roughness of less than 1nm RMS which means it has a super smooth surface.
- As for a total reflection mirror method, it has less chromatic aberration compare to optical elements such as Zone Plate and higher flexibility of the working distance, and it makes possible to design any optical system to match your experiment equipments.
|surface shape||Plane, cylinder, sphere, ellipse, parabola, hyperbola and more|
|materials||silicon, fused silica, ULE and more|
|slope error||＜1.0nm (PV) （or ＜0.3nm RMS）|
|roughness||＜0.1nmRMS (optical area 100μm×100μm)|
|coating||Pt, Au, Rh, Pd, Ag, Ni, Crand other|
1By fabricating a 1m long mirror to PV 2nm, when it reflects X-rays, it controls dispersion and holds the wave surface, peculiar to synchrotron radiation created in SPring-8, uniform.
PV= Peak to Valley: the difference between the highest point, peak, and the lowest point, valley.
In various studies and analyses using X-rays, we contribute to new knowledge being provided by our mirror.
It is equivalent to making 500km between Tokyo and Osaka at PV±0.5mm to make a mirror of the 1m length at PV±1nm.
In order to keep the shape error to less than 2nm to the target shape, it enables to focus to the diffraction limit.
Diffraction limit: Theoretical limit of resolution and the resolving power limited by diffraction of the light in the optical system
See an example of focusing result on the right. To have a smaller diameter of the focus spot, it enables higher resolution analysis and it promotes the study of medicine, pharmacy and material science.
H.Ohashi, H.Yamazaki, H.Yumoto, T.Koyama et al., SRI2012. courtesy of JASRI
Since EEM polishing can be applied locally, we can make several different shapes on a mirror surface. By making different shapes for different focus sizes, you can skip mirror changing procedure for an exreriment for different focus size x-ray. You can save time for re-mounting and adjusting.
Montel mirrors are two same shaped mirrors located next to each other, not like KB mirrors, located front and back to the beam direction. They are efficient in expanding the limitation of incidence angle at down stream area when KB mirrors are placed.
AKB(Advanved Kirkpatric-Baez)one dimentional wolter mirror
courtesy of Osaka university graduate school of engineering
In order to place one dimention Wolter mirror in KB location, you can have merit of Wolter mirror. As in the past one dimention Wolter mirror was made with ellipse mirror and hyperbola mirror, however, by placing in KB location you needed 4 mirrors and needed to waste time for mounting and adjusting. By fabricating two different shapes to slope error of 1nm, you can save time for adjusting and at the same time it makes it possible to focus to the diffraction limit.
Wolter mirror: it consists of two sides axis symmetry rotary paraboloid and rotary hyperboloid and focuses in one spot. Parallel beam which incidence on any reflecting surface of the mirror has constant light path length and it converges in one focus spot that comatic aberration can be reduced. In addition, Wolter mirror has a feature of higher focus efficiency than other X-ray optical elements.
additional machining(fabrication) on request
We improve your mirrors. By improving slope error, you can obtain smaller focus size and improving roughness, you can expect better reflectivity.
variety of coating on optical surface on requet
|coating material||Au, Pt, Rh, Pd, Cr, Ni, Ag and other|
|coating area of optical surface||1000mm (L：direction of beam) × 100mm (W：vertical direction to the beam)|
On the refleciton surface of an x-ray mirror it need a coating that matches its energy of x-ray reflection (wave length).