IDS Gratings with the 235 mm Camera
The IDS gratings have a ruled area of 102 mm x 128 mm. A wide selection is available, and some of the important characteristics of each grating are summarised in the Table below.
The two available CCDs for IDS are EEV10 and RED+2, the pixel size and scale
of the two detectors are:
EEV10: 13.5 micron pixel with a scale of 74.1 pixels/mm and 0.40"/pixel;
RED+2: 15.0 micron pixel with a scale of 66.7 pixels/mm and 0.44"/pixel.
Name |
Origin |
Ruling (lines mm-1) |
Blaze (Å) |
Efficiency (%) |
Central wavelength (Å) |
Dispersion with EEV10 (Å pixel-1) |
Dispersion with RED+2 (Å pixel-1) | Entrance slit for 30μm at detector (arcsec) |
R150V |
B+L |
150 |
5250 |
66 |
5500 |
3.66 |
4.03 |
1.03 |
R300V |
NPL |
300 |
5460 |
72 |
5500 |
1.87 |
2.06 |
1.05 |
R400B |
B+L |
400 |
3900 |
50 |
4000 |
1.41 |
1.55 |
1.06 |
R400V |
B+L |
400 |
5100 |
72 |
5500 |
1.41 |
1.55 |
1.08 |
R400R |
B+L |
400 |
7250 |
59 |
8000 |
1.41 |
1.55 |
1.11 |
R600R |
B+L |
600 |
6700 |
65 |
7000 |
0.94 |
1.03 |
1.16 |
R600IR |
B+L |
600 |
10000 |
70 |
8500 |
0.95 |
1.04 |
1.19 |
R632V |
NPL |
632 |
5460 |
72 |
5500 |
0.90 |
0.99 |
1.11 |
R831R |
B+L |
831 |
7500 |
65 |
8000 |
0.68 |
0.75 |
1.27 |
R900V |
B+L |
900 |
5100 |
69 |
5000 |
0.63 |
0.69 |
1.17 |
R1200U |
J-Y |
1200 |
3500 |
68 |
3500 |
0.48 |
0.53 |
1.15 |
R1200B |
J-Y |
1200 |
4000 |
76 |
3500 |
0.48 |
0.53 |
1.15 |
R1200V |
B+L |
1200 |
6000 |
68 |
6500 |
0.48 |
0.53 |
1.33 |
R1200R |
B+L |
1200 |
8000 |
66 |
70004 |
0.47 |
0.52 |
1.37 |
H1800V | PTR/NPL |
1800 |
5300 |
64 |
50005,6 |
0.31 |
0.34 |
1.40 |
H2400B |
J-Y |
2400 |
4000 |
60 |
35005,7 |
0.24 |
0.26 |
1.37 |
1) Prefix R for ruled grating ; prefix H for holographic grating.
2) Key: NPL =National Physical Laboratory B+L =Bausch and Lomb.
J-Y =Jobin-Yvon PTR/NPL =PTR replica from NPL master.
3) Absolute efficiency values measured at RGO.
4) At low and intermediate dispersions the dispersion changes little with central wavelength.
5) Near maximum useful angle of incidence
6) Optimized for 5000-7000 A.
7) Optimized for 3500-5500 A.
The efficiency of the gratings as a function of wavelength is shown in the Figures below.
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