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Gratings >> Aberration
Corrected Spherical Grating
Aberration Corrected Spherical Holographic
Grating
Specifications
and Control
| Ultimate Specification |
Standard Specification |
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
t0 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 | Optimised
using JY proprietary software according to required
optical layout |
Moiré Fringes
(JY Patent) Optical control using recording layout (JY Patent) |
|
| Efficiency | Groove
depth and duty cycle ratio optimised by JY proprietary
software according to required optical layout |
||
| Groove Depth | +/-
5% |
+/-
10 |
AFM measurements |
| c/d Ratio | +/-
5% |
+/-
10 |
AFM
measurements |
Examples of Spherical Aberration Corrected Holographic Gratings
| Size mm |
Optical Surface mm |
Slope Error arcsec rms |
Microroughness Å rms |
Coating |
Substrate |
200x50x30 |
190x45 |
0.2
arcsec rms |
Less
than 5 |
Au
or Pt |
Silicon Fused Silica |
150x30x30 |
140x20 |
0.2
arcsec rms |
Less
than 5 |
Au
or Pt |
Silicon Fused Silica |
75x15x150 |
70x10 |
0.1
arcsec rms |
Less
than 5 |
Au
or Pt |
Silicon Fused Silica |
Note: Groove density is obtained by interference of two spherical wavefronts.
