While choosing a device configuration it is important to select properly the diffraction gratings. A right selection of the diffraction grating allows one to obtain the best combination of high energetic efficiency and spectral resolution.

The basic grating parameters which determine their right choice you can find in the methodical material “Spectral Instrument. Basic Concepts and Characteristics.”

We propose a wide range of diffraction gratings to be used in the MS520 series monochromator-spectrographs. Please, choose a necessary grating from the given below list, or consult our specialists. ## Basic parameters for correct selection of diffraction gratings:

In the table “Selection of diffraction gratings” groove density and blaze wavelength belong to a diffraction grating parameters. Other parameters characterize a spectral device together with a selected grating.

• Groove density
The diffraction grating has a periodic structure. Such parameters as resolving power and free spectral range are determined by the periodic structure properties of a diffraction grating. The period of grating is the distance through which grooves are repeated. The reciprocal value of a grating period is called the groove density and displays the number of grooves in 1 mm.
• Blaze wavelength
The reflectivity of a grating depends on the grooves geometry, because the direction to the center of the diffraction maximum is determined by the mirror reflection of the incident beam from the edge of a groove. In spite of rather flat profile of diffraction maximum a blaze wavelength that corresponds to the maximum efficiency of the grating has been adopted as a feature for convenience of calculation. When selecting a grating it is useful to determine a blaze wavelength for a required grating on the spectral range of limited wavelengths WL1 and WL2. The blaze wavelength is determined by the ratio:
WLBlaze = 2 ∙ WL1 ∙ WL2 / (WL1 + WL2).
• Reciprocal linear dispersion
The light from a grating in the focal plane of a spectral instrument forms a spectrum. Linear dispersion is used for a spectrum characteristic, which is defined as a reciprocal value of the product of angular dispersion of a grating and focal length of a spectral instrument and shows the spectral range that falls on a single linear distance in a focal plane.
• The spectral resolution
Limiting resolution of a spectral instrument is equal to the minimum half-width of its instrument function. The instrument function is determined by finite sizes of entrance diaphragm, aberrations and also distortions caused by inaccuracy in manufacturing and adjustment of optical elements of instrument. In addition, instrument function, and thus spectral resolution are dependent on lighting method of entrance slit, used aperture and registration system parameters.
• Operating wavelength range
Energy efficiency range referred to the wavelength region in which grating reflection coefficient is not less than 0.405 of the maximum. In the first order this range is limited by the wavelengths: ⅔ ∙ WLBlaze and 2 ∙ WLBlaze.
Operating range usually corresponds to a grating energy efficiency. In some cases, for gratings with a high groove density and large blaze wavelength, the long-wave border of operating spectral range of instrument is limited by a maximal rotation angle of a grating which is defined by design of instrument.

## Table for selection of diffraction gratings

ModelLine density, mm-1Blaze wavelength, nm*Reciprocal linear dispersion, nm/mmSpectral resolution, nmOperating wavelengths range, nmSpectral range limited by the grating rotation angle, nm
750.11 (wavelength 200 nm, 120 order)0.0024 (wavelength 200 nm, 120 order)
7836003600hol0.51**0.011185 – 450500
78242224002250.790.017185 – 450750
78242724002700.780.017185 – 540750
78244024004000.740.016270 – 750750
78182718002701.050.023185 – 5401000
78184018004001.030.022270 – 8001000
781840180050010.022335 – 10001000
78187518007500.860.019500 – 10001000
78122512002501.60.035185 – 5001500
78122812002801.590.035190 – 5601500
78124012004001.580.035270 – 8001500
78125012005001.570.034335 – 10001500
78126012006001.540.034400 – 12001500
78127512007501.50.033500 – 15001500
7806236002303.190.07185 – 4603000
7806306003003.190.07200 – 6003000
7806406004003.190.07270 – 8003000
7806506005003.190.07335 – 10003000
7806606006003.190.07400 – 12003000
7806756007503.170.069500 – 15003000
78040084008004.780.1535 – 16004500
780401240012004.750.1800 – 24004500
780401740017004.660.11135 – 34004500
780402040020004.570.11335 – 40004500
780402540025004.380.11670 – 45004500
7803303003006.370.14200 – 6006000
7803353003506.370.14235 – 7006000
7803503005006.380.14335 – 10006000
7803603006006.380.14400 – 12006000
7803703007006.390.14470 – 14006000
780301030010006.380.14670 – 20006000
780301530015006.340.141000 – 30006000
780302030020006.270.141335 – 40006000
780303030030005.980.132000 – 60006000
780303530035005.770.132330 – 60006000
7802352003509.550.21235 – 7009000
7802402004009.550.21270 – 8009000
7802502005009.560.21335 – 10009000
7802702007009.570.21470 – 14009000
780201520015009.570.211000 – 30009000
780202020020009.540.211335 – 40009000
780202520025009.480.211670 – 50009000
780203020030009.40.212000 – 60009000
78154715047512.70.28320 – 95012000
78157015070012.70.28470 – 140012000
7815030150300012.70.282000 – 600012000
7815045150450012.40.273000 – 900012000
78016510065019.10.42435 – 130018000
78017010070019.10.42470 – 140018000
7801010100100019.10.42670 – 200018000
7801020100200019.20.421335 – 400018000
7801025100250019.20.421670 – 500018000
7801030100300019.10.422000 – 600018000
7801042100420019.10.422800 – 840018000
78010481004800190.413200 – 960018000
7801055100550018.90.413670 – 1100018000
7801062100620018.80.414130 – 1240018000
7801072100720018.50.44800 – 1440018000
78010881008750180.395830 – 1750018000
7801097100970017.70.396470 – 1800018000
78011031001030017.40.386870 – 1800018000
787507075700025.20.554670 – 1400024000
787509575950024.70.546330 – 1900024000
785001050100038.20.83670 – 200036000
785003850380038.30.842530 – 760036000
785006350630038.30.844200 – 1260036000
785007050700038.20.834670 – 1400036000
785008350830038.10.835530 – 1660036000
7850124501240037.50.828270 – 2480036000
7850169501690036.30.7911270 – 3380036000
7850200502000035.10.7713330 – 3600036000
783702837.52800511.111870 – 560048000
783705637.5560051.11.123735 – 1120048000
783709337.59300511.116200 – 1860048000
783715637.51560050.21.110400 – 3120048000
7824116241160079.81.747730 – 2320075000
7824144241440079.71.749600 – 2880075000
7824173241730079.41.7311530 – 3460075000
7824243242430078.51.7116200 – 4860075000
7824285242850077.61.6919000 – 5700075000
7824325243250076.51.6721670 – 6500075000

### Gratings with line density 75 mm-1

• Model: *reciprocal linear dispersion = 0.11 nm/mm (wavelength 200 nm, 120 order); spectral resolution = 0.0024 nm (wavelength 200 nm, 120 order).

### Gratings with line density 3600 mm-1

• Model 783600: blaze wavelength = hol; *reciprocal linear dispersion = 0.51** nm/mm; spectral resolution = 0.011 nm; operating wavelengths range = 185-450 nm; spectral range limited by the grating rotation angle = 500 nm.

### Gratings with line density 2400 mm-1

• Model 782422: blaze wavelength = 225 nm; *reciprocal linear dispersion = 0.79 nm/mm; spectral resolution = 0.017 nm; operating wavelengths range = 185-450 nm; spectral range limited by the grating rotation angle = 750 nm.
• Model 782427: blaze wavelength = 270 nm; *reciprocal linear dispersion = 0.78 nm/mm; spectral resolution = 0.017 nm; operating wavelengths range = 185-540 nm; spectral range limited by the grating rotation angle = 750 nm.
• Model 782440: blaze wavelength = 400 nm; *reciprocal linear dispersion = 0.74 nm/mm; spectral resolution = 0.016 nm; operating wavelengths range = 270-750 nm; spectral range limited by the grating rotation angle = 750 nm.

### Gratings with line density 1800 mm-1

• Model 781827: blaze wavelength = 270 nm; *reciprocal linear dispersion = 1.05 nm/mm; spectral resolution = 0.023 nm; operating wavelengths range = 185-540 nm; spectral range limited by the grating rotation angle = 1000 nm.
• Model 781840: blaze wavelength = 400 nm; *reciprocal linear dispersion = 1.03 nm/mm; spectral resolution = 0.022 nm; operating wavelengths range = 270-800 nm; spectral range limited by the grating rotation angle = 1000 nm.
• Model 781840: blaze wavelength = 500 nm; *reciprocal linear dispersion = 1 nm/mm; spectral resolution = 0.022 nm; operating wavelengths range = 335-1000 nm; spectral range limited by the grating rotation angle = 1000 nm.
• Model 781875: blaze wavelength = 750 nm; *reciprocal linear dispersion = 0.86 nm/mm; spectral resolution = 0.019 nm; operating wavelengths range = 500-1000 nm; spectral range limited by the grating rotation angle = 1000 nm.

### Gratings with line density 1200 mm-1

• Model 781225: blaze wavelength = 250 nm; *reciprocal linear dispersion = 1.6 nm/mm; spectral resolution = 0.035 nm; operating wavelengths range = 185-500 nm; spectral range limited by the grating rotation angle = 1500 nm.
• Model 781228: blaze wavelength = 280 nm; *reciprocal linear dispersion = 1.59 nm/mm; spectral resolution = 0.035 nm; operating wavelengths range = 190-560 nm; spectral range limited by the grating rotation angle = 1500 nm.
• Model 781240: blaze wavelength = 400 nm; *reciprocal linear dispersion = 1.58 nm/mm; spectral resolution = 0.035 nm; operating wavelengths range = 270-800 nm; spectral range limited by the grating rotation angle = 1500 nm.
• Model 781250: blaze wavelength = 500 nm; *reciprocal linear dispersion = 1.57 nm/mm; spectral resolution = 0.034 nm; operating wavelengths range = 335-1000 nm; spectral range limited by the grating rotation angle = 1500 nm.
• Model 781260: blaze wavelength = 600 nm; *reciprocal linear dispersion = 1.54 nm/mm; spectral resolution = 0.034 nm; operating wavelengths range = 400-1200 nm; spectral range limited by the grating rotation angle = 1500 nm.
• Model 781275: blaze wavelength = 750 nm; *reciprocal linear dispersion = 1.5 nm/mm; spectral resolution = 0.033 nm; operating wavelengths range = 500-1500 nm; spectral range limited by the grating rotation angle = 1500 nm.

### Gratings with line density 600 mm-1

• Model 780623: blaze wavelength = 230 nm; *reciprocal linear dispersion = 3.19 nm/mm; spectral resolution = 0.07 nm; operating wavelengths range = 185-460 nm; spectral range limited by the grating rotation angle = 3000 nm.
• Model 780630: blaze wavelength = 300 nm; *reciprocal linear dispersion = 3.19 nm/mm; spectral resolution = 0.07 nm; operating wavelengths range = 200-600 nm; spectral range limited by the grating rotation angle = 3000 nm.
• Model 780640: blaze wavelength = 400 nm; *reciprocal linear dispersion = 3.19 nm/mm; spectral resolution = 0.07 nm; operating wavelengths range = 270-800 nm; spectral range limited by the grating rotation angle = 3000 nm.
• Model 780650: blaze wavelength = 500 nm; *reciprocal linear dispersion = 3.19 nm/mm; spectral resolution = 0.07 nm; operating wavelengths range = 335-1000 nm; spectral range limited by the grating rotation angle = 3000 nm.
• Model 780660: blaze wavelength = 600 nm; *reciprocal linear dispersion = 3.19 nm/mm; spectral resolution = 0.07 nm; operating wavelengths range = 400-1200 nm; spectral range limited by the grating rotation angle = 3000 nm.
• Model 780675: blaze wavelength = 750 nm; *reciprocal linear dispersion = 3.17 nm/mm; spectral resolution = 0.069 nm; operating wavelengths range = 500-1500 nm; spectral range limited by the grating rotation angle = 3000 nm.

### Gratings with line density 400 mm-1

• Model 7804008: blaze wavelength = 800 nm; *reciprocal linear dispersion = 4.78 nm/mm; spectral resolution = 0.1 nm; operating wavelengths range = 535-1600 nm; spectral range limited by the grating rotation angle = 4500 nm.
• Model 7804012: blaze wavelength = 1200 nm; *reciprocal linear dispersion = 4.75 nm/mm; spectral resolution = 0.1 nm; operating wavelengths range = 800-2400 nm; spectral range limited by the grating rotation angle = 4500 nm.
• Model 7804017: blaze wavelength = 1700 nm; *reciprocal linear dispersion = 4.66 nm/mm; spectral resolution = 0.1 nm; operating wavelengths range = 1135-3400 nm; spectral range limited by the grating rotation angle = 4500 nm.
• Model 7804020: blaze wavelength = 2000 nm; *reciprocal linear dispersion = 4.57 nm/mm; spectral resolution = 0.1 nm; operating wavelengths range = 1335-4000 nm; spectral range limited by the grating rotation angle = 4500 nm.
• Model 7804025: blaze wavelength = 2500 nm; *reciprocal linear dispersion = 4.38 nm/mm; spectral resolution = 0.1 nm; operating wavelengths range = 1670-4500 nm; spectral range limited by the grating rotation angle = 4500 nm.

### Gratings with line density 300 mm-1

• Model 780330: blaze wavelength = 300 nm; *reciprocal linear dispersion = 6.37 nm/mm; spectral resolution = 0.14 nm; operating wavelengths range = 200-600 nm; spectral range limited by the grating rotation angle = 6000 nm.
• Model 780335: blaze wavelength = 350 nm; *reciprocal linear dispersion = 6.37 nm/mm; spectral resolution = 0.14 nm; operating wavelengths range = 235-700 nm; spectral range limited by the grating rotation angle = 6000 nm.
• Model 780350: blaze wavelength = 500 nm; *reciprocal linear dispersion = 6.38 nm/mm; spectral resolution = 0.14 nm; operating wavelengths range = 335-1000 nm; spectral range limited by the grating rotation angle = 6000 nm.
• Model 780360: blaze wavelength = 600 nm; *reciprocal linear dispersion = 6.38 nm/mm; spectral resolution = 0.14 nm; operating wavelengths range = 400-1200 nm; spectral range limited by the grating rotation angle = 6000 nm.
• Model 780370: blaze wavelength = 700 nm; *reciprocal linear dispersion = 6.39 nm/mm; spectral resolution = 0.14 nm; operating wavelengths range = 470-1400 nm; spectral range limited by the grating rotation angle = 6000 nm.
• Model 7803010: blaze wavelength = 1000 nm; *reciprocal linear dispersion = 6.38 nm/mm; spectral resolution = 0.14 nm; operating wavelengths range = 670-2000 nm; spectral range limited by the grating rotation angle = 6000 nm.
• Model 7803015: blaze wavelength = 1500 nm; *reciprocal linear dispersion = 6.34 nm/mm; spectral resolution = 0.14 nm; operating wavelengths range = 1000-3000 nm; spectral range limited by the grating rotation angle = 6000 nm.
• Model 7803020: blaze wavelength = 2000 nm; *reciprocal linear dispersion = 6.27 nm/mm; spectral resolution = 0.14 nm; operating wavelengths range = 1335-4000 nm; spectral range limited by the grating rotation angle = 6000 nm.
• Model 7803030: blaze wavelength = 3000 nm; *reciprocal linear dispersion = 5.98 nm/mm; spectral resolution = 0.13 nm; operating wavelengths range = 2000-6000 nm; spectral range limited by the grating rotation angle = 6000 nm.
• Model 7803035: blaze wavelength = 3500 nm; *reciprocal linear dispersion = 5.77 nm/mm; spectral resolution = 0.13 nm; operating wavelengths range = 2330-6000 nm; spectral range limited by the grating rotation angle = 6000 nm.

### Gratings with line density 200 mm-1

• Model 780235: blaze wavelength = 350 nm; *reciprocal linear dispersion = 9.55 nm/mm; spectral resolution = 0.21 nm; operating wavelengths range = 235-700 nm; spectral range limited by the grating rotation angle = 9000 nm.
• Model 780240: blaze wavelength = 400 nm; *reciprocal linear dispersion = 9.55 nm/mm; spectral resolution = 0.21 nm; operating wavelengths range = 270-800 nm; spectral range limited by the grating rotation angle = 9000 nm.
• Model 780250: blaze wavelength = 500 nm; *reciprocal linear dispersion = 9.56 nm/mm; spectral resolution = 0.21 nm; operating wavelengths range = 335-1000 nm; spectral range limited by the grating rotation angle = 9000 nm.
• Model 780270: blaze wavelength = 700 nm; *reciprocal linear dispersion = 9.57 nm/mm; spectral resolution = 0.21 nm; operating wavelengths range = 470-1400 nm; spectral range limited by the grating rotation angle = 9000 nm.
• Model 7802015: blaze wavelength = 1500 nm; *reciprocal linear dispersion = 9.57 nm/mm; spectral resolution = 0.21 nm; operating wavelengths range = 1000-3000 nm; spectral range limited by the grating rotation angle = 9000 nm.
• Model 7802020: blaze wavelength = 2000 nm; *reciprocal linear dispersion = 9.54 nm/mm; spectral resolution = 0.21 nm; operating wavelengths range = 1335-4000 nm; spectral range limited by the grating rotation angle = 9000 nm.
• Model 7802025: blaze wavelength = 2500 nm; *reciprocal linear dispersion = 9.48 nm/mm; spectral resolution = 0.21 nm; operating wavelengths range = 1670-5000 nm; spectral range limited by the grating rotation angle = 9000 nm.
• Model 7802030: blaze wavelength = 3000 nm; *reciprocal linear dispersion = 9.4 nm/mm; spectral resolution = 0.21 nm; operating wavelengths range = 2000-6000 nm; spectral range limited by the grating rotation angle = 9000 nm.

### Gratings with line density 150 mm-1

• Model 781547: blaze wavelength = 475 nm; *reciprocal linear dispersion = 12.7 nm/mm; spectral resolution = 0.28 nm; operating wavelengths range = 320-950 nm; spectral range limited by the grating rotation angle = 12000 nm.
• Model 781570: blaze wavelength = 700 nm; *reciprocal linear dispersion = 12.7 nm/mm; spectral resolution = 0.28 nm; operating wavelengths range = 470-1400 nm; spectral range limited by the grating rotation angle = 12000 nm.
• Model 7815030: blaze wavelength = 3000 nm; *reciprocal linear dispersion = 12.7 nm/mm; spectral resolution = 0.28 nm; operating wavelengths range = 2000-6000 nm; spectral range limited by the grating rotation angle = 12000 nm.
• Model 7815045: blaze wavelength = 4500 nm; *reciprocal linear dispersion = 12.4 nm/mm; spectral resolution = 0.27 nm; operating wavelengths range = 3000-9000 nm; spectral range limited by the grating rotation angle = 12000 nm.

### Gratings with line density 100 mm-1

• Model 780165: blaze wavelength = 650 nm; *reciprocal linear dispersion = 19.1 nm/mm; spectral resolution = 0.42 nm; operating wavelengths range = 435-1300 nm; spectral range limited by the grating rotation angle = 18000 nm.
• Model 780170: blaze wavelength = 700 nm; *reciprocal linear dispersion = 19.1 nm/mm; spectral resolution = 0.42 nm; operating wavelengths range = 470-1400 nm; spectral range limited by the grating rotation angle = 18000 nm.
• Model 7801010: blaze wavelength = 1000 nm; *reciprocal linear dispersion = 19.1 nm/mm; spectral resolution = 0.42 nm; operating wavelengths range = 670-2000 nm; spectral range limited by the grating rotation angle = 18000 nm.
• Model 7801020: blaze wavelength = 2000 nm; *reciprocal linear dispersion = 19.2 nm/mm; spectral resolution = 0.42 nm; operating wavelengths range = 1335-4000 nm; spectral range limited by the grating rotation angle = 18000 nm.
• Model 7801025: blaze wavelength = 2500 nm; *reciprocal linear dispersion = 19.2 nm/mm; spectral resolution = 0.42 nm; operating wavelengths range = 1670-5000 nm; spectral range limited by the grating rotation angle = 18000 nm.
• Model 7801030: blaze wavelength = 3000 nm; *reciprocal linear dispersion = 19.1 nm/mm; spectral resolution = 0.42 nm; operating wavelengths range = 2000-6000 nm; spectral range limited by the grating rotation angle = 18000 nm.
• Model 7801042: blaze wavelength = 4200 nm; *reciprocal linear dispersion = 19.1 nm/mm; spectral resolution = 0.42 nm; operating wavelengths range = 2800-8400 nm; spectral range limited by the grating rotation angle = 18000 nm.
• Model 7801048: blaze wavelength = 4800 nm; *reciprocal linear dispersion = 19 nm/mm; spectral resolution = 0.41 nm; operating wavelengths range = 3200-9600 nm; spectral range limited by the grating rotation angle = 18000 nm.
• Model 7801055: blaze wavelength = 5500 nm; *reciprocal linear dispersion = 18.9 nm/mm; spectral resolution = 0.41 nm; operating wavelengths range = 3670-11000 nm; spectral range limited by the grating rotation angle = 18000 nm.
• Model 7801062: blaze wavelength = 6200 nm; *reciprocal linear dispersion = 18.8 nm/mm; spectral resolution = 0.41 nm; operating wavelengths range = 4130-12400 nm; spectral range limited by the grating rotation angle = 18000 nm.
• Model 7801072: blaze wavelength = 7200 nm; *reciprocal linear dispersion = 18.5 nm/mm; spectral resolution = 0.4 nm; operating wavelengths range = 4800-14400 nm; spectral range limited by the grating rotation angle = 18000 nm.
• Model 7801088: blaze wavelength = 8750 nm; *reciprocal linear dispersion = 18 nm/mm; spectral resolution = 0.39 nm; operating wavelengths range = 5830-17500 nm; spectral range limited by the grating rotation angle = 18000 nm.
• Model 7801097: blaze wavelength = 9700 nm; *reciprocal linear dispersion = 17.7 nm/mm; spectral resolution = 0.39 nm; operating wavelengths range = 6470-18000 nm; spectral range limited by the grating rotation angle = 18000 nm.
• Model 7801103: blaze wavelength = 10300 nm; *reciprocal linear dispersion = 17.4 nm/mm; spectral resolution = 0.38 nm; operating wavelengths range = 6870-18000 nm; spectral range limited by the grating rotation angle = 18000 nm.

### Gratings with line density 75 mm-1

• Model 7875070: blaze wavelength = 7000 nm; *reciprocal linear dispersion = 25.2 nm/mm; spectral resolution = 0.55 nm; operating wavelengths range = 4670-14000 nm; spectral range limited by the grating rotation angle = 24000 nm.
• Model 7875095: blaze wavelength = 9500 nm; *reciprocal linear dispersion = 24.7 nm/mm; spectral resolution = 0.54 nm; operating wavelengths range = 6330-19000 nm; spectral range limited by the grating rotation angle = 24000 nm.

### Gratings with line density 50 mm-1

• Model 7850010: blaze wavelength = 1000 nm; *reciprocal linear dispersion = 38.2 nm/mm; spectral resolution = 0.83 nm; operating wavelengths range = 670-2000 nm; spectral range limited by the grating rotation angle = 36000 nm.
• Model 7850038: blaze wavelength = 3800 nm; *reciprocal linear dispersion = 38.3 nm/mm; spectral resolution = 0.84 nm; operating wavelengths range = 2530-7600 nm; spectral range limited by the grating rotation angle = 36000 nm.
• Model 7850063: blaze wavelength = 6300 nm; *reciprocal linear dispersion = 38.3 nm/mm; spectral resolution = 0.84 nm; operating wavelengths range = 4200-12600 nm; spectral range limited by the grating rotation angle = 36000 nm.
• Model 7850070: blaze wavelength = 7000 nm; *reciprocal linear dispersion = 38.2 nm/mm; spectral resolution = 0.83 nm; operating wavelengths range = 4670-14000 nm; spectral range limited by the grating rotation angle = 36000 nm.
• Model 7850083: blaze wavelength = 8300 nm; *reciprocal linear dispersion = 38.1 nm/mm; spectral resolution = 0.83 nm; operating wavelengths range = 5530-16600 nm; spectral range limited by the grating rotation angle = 36000 nm.
• Model 7850124: blaze wavelength = 12400 nm; *reciprocal linear dispersion = 37.5 nm/mm; spectral resolution = 0.82 nm; operating wavelengths range = 8270-24800 nm; spectral range limited by the grating rotation angle = 36000 nm.
• Model 7850169: blaze wavelength = 16900 nm; *reciprocal linear dispersion = 36.3 nm/mm; spectral resolution = 0.79 nm; operating wavelengths range = 11270-33800 nm; spectral range limited by the grating rotation angle = 36000 nm.
• Model 7850200: blaze wavelength = 20000 nm; *reciprocal linear dispersion = 35.1 nm/mm; spectral resolution = 0.77 nm; operating wavelengths range = 13330-36000 nm; spectral range limited by the grating rotation angle = 36000 nm.

### Gratings with line density 37.5 mm-1

• Model 7837028: blaze wavelength = 2800 nm; *reciprocal linear dispersion = 51 nm/mm; spectral resolution = 1.11 nm; operating wavelengths range = 1870-5600 nm; spectral range limited by the grating rotation angle = 48000 nm.
• Model 7837056: blaze wavelength = 5600 nm; *reciprocal linear dispersion = 51.1 nm/mm; spectral resolution = 1.12 nm; operating wavelengths range = 3735-11200 nm; spectral range limited by the grating rotation angle = 48000 nm.
• Model 7837093: blaze wavelength = 9300 nm; *reciprocal linear dispersion = 51 nm/mm; spectral resolution = 1.11 nm; operating wavelengths range = 6200-18600 nm; spectral range limited by the grating rotation angle = 48000 nm.
• Model 7837156: blaze wavelength = 15600 nm; *reciprocal linear dispersion = 50.2 nm/mm; spectral resolution = 1.1 nm; operating wavelengths range = 10400-31200 nm; spectral range limited by the grating rotation angle = 48000 nm.

### Gratings with line density 24 mm-1

• Model 7824116: blaze wavelength = 11600 nm; *reciprocal linear dispersion = 79.8 nm/mm; spectral resolution = 1.74 nm; operating wavelengths range = 7730-23200 nm; spectral range limited by the grating rotation angle = 75000 nm.
• Model 7824144: blaze wavelength = 14400 nm; *reciprocal linear dispersion = 79.7 nm/mm; spectral resolution = 1.74 nm; operating wavelengths range = 9600-28800 nm; spectral range limited by the grating rotation angle = 75000 nm.
• Model 7824173: blaze wavelength = 17300 nm; *reciprocal linear dispersion = 79.4 nm/mm; spectral resolution = 1.73 nm; operating wavelengths range = 11530-34600 nm; spectral range limited by the grating rotation angle = 75000 nm.
• Model 7824243: blaze wavelength = 24300 nm; *reciprocal linear dispersion = 78.5 nm/mm; spectral resolution = 1.71 nm; operating wavelengths range = 16200-48600 nm; spectral range limited by the grating rotation angle = 75000 nm.
• Model 7824285: blaze wavelength = 28500 nm; *reciprocal linear dispersion = 77.6 nm/mm; spectral resolution = 1.69 nm; operating wavelengths range = 19000-57000 nm; spectral range limited by the grating rotation angle = 75000 nm.
• Model 7824325: blaze wavelength = 32500 nm; *reciprocal linear dispersion = 76.5 nm/mm; spectral resolution = 1.67 nm; operating wavelengths range = 21670-65000 nm; spectral range limited by the grating rotation angle = 75000 nm.

* At the blaze wavelength.
** At the wavelength 255 nm.
For blaze wavelength 2000 nm and shorter the data measured by multielement detectors with entrance slit 15 microns.
For the wavelength more than 2000 nm the data obtained by calculation with the entrance slit 15 microns.