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Gratings >> Variable Line
Space Spherical Grating
Variable Line Space Spherical Holographic
Grating
Specifications
and Control
| Ultimate Specifications |
Standard Specifications |
Control |
|
| Dimension | Up
to 250 mm length |
||
| Radius of Curvature | Down
to 0.01% |
0.5
% |
Calibrated
samples LTP Measurements |
| Slope Error | Down
to 0.1 arcsec rms |
0.2
arcsec rms |
LTP
Measurements Interferometer |
| Microroughness | Down
to 2 Å rms |
5 Å rms |
Micromap
measurements |
| Substrate | Silicon Fused Silica SiC CVD |
||
| Coating | Au Pt AlMgF Ni |
Cr
binding layer |
Quartz
monitoring |
| Groove Density | Follows
a polynomial law Recording layout using JY proprietary software Optical ray tracing of the monochromator |
Moiré Fringes
(JY patent) LTP measurement |
|
| Efficiency | Groove
depth and duty cycle ratio optimised with JY proprietary
software |
||
| Groove Depth | +/-
5% |
+/-
10% |
AFM
measurements |
| c/d Ratio | +/-
5% |
+/-
10% |
AFM
measurements |
Examples of Spherical Variable Line Space Plane Holographic Gratings
| Size mm |
Optical surface mm |
Slope Error arcsec rms |
Max Microroughness Å rms |
Coating |
Substrate |
200x50x30 |
190x45 |
0.2
arcsec rms |
5 |
Au
or Pt |
Silicon Fused Silica |
150x40x25 |
140x35 |
0.2
arcsec rms |
5 |
Au
or Pt |
Silicon Fused Silica |
100x30x20 |
90x25 |
0.1
arcsec rms |
5 |
Au
or Pt |
Silicon Fused Silica |
Note: Recording wavefronts are either two spherical, one spherical and one aspherical or both aspherical depending on the required polynomial.
