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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.


    • Name1
    		 Origin2
    Ruling (lines mm-1)
    Blaze (Å)
    		 Efficiency3(%)
    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
    R1200U4
    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
    R1200Y5
    B+L
    1200
    6000
    68
    6500
    0.48
    0.53
    1.33
    R1200R
    B+L
    1200
    8000
    66
    70006
    0.47
    0.52
    1.37
    H1800V
    PTR/NPL
    1800
    5300
    64
    50007,8
    0.31
    0.34
    1.40
    H2400B
    J-Y
    2400
    4000
    60
    35007,9
    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) R1200U corresponds to the R1200K grating in the efficiency curves below.
    5) R1200Y corresponds roughly to a V band.
    6) At low and intermediate dispersions the dispersion changes little with central wavelength.
    7) Near maximum useful angle of incidence.
    8) Optimized for 5000-7000 A.
    9) 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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    Contact:  (IDS Instrument Specialist)
    Last modified: 08 January 2013