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 MS200 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
4436003600hol1.35**0.04185 – 430430
44242224002252.080.06185 – 450650
44242724002702.060.06185 – 540650
44277024004001.970.06265 – 650650
44182718002702.780.08185 – 540870
44184018004002.730.08265 – 800870
44185018005002.660.08330 – 870870
44187518007502.310.08500 – 870870
44122512002504.190.12185 – 5001300
44122812002804.190.12185 – 5601300
44124012004004.170.12265 – 8001300
44125012005004.140.12330 – 10001300
44126012006004.090.12400 – 12001300
44127512007503.980.12500 – 13001300
4406236002308.340.25185 – 4602600
4406306003008.350.25200 – 6002600
4406406004008.370.25265 – 8002600
4406506005008.370.25330 – 10002600
4406606006008.370.25400 – 12002600
4406756007508.350.25500 – 15002600
44042840028012.490.36185 – 5603900
4404008400800 12.560.36570 – 15203900
4404012400120012.510.36800 – 24003900
4404017400170012.330.361200 – 32003900
4404020400200012.150.361400 – 38003900
4404025400250011.700.361800 – 47503900
44033030030016.640.48200 – 6005200
44033530035016.650.48230 – 7005200
44035030050016.690.48330 – 10005200
44036030060016.710.48400 – 12005200
44037030070016.720.48465 – 14005200
4403010300100016.750.48700 – 19005200
4403015300150016.710.481000 – 28505200
4403020300200016.560.481400 – 38005200
4403030300300015.930.482100 – 52005200
4403035300350015.420.482500 – 52005200
44023520035024.930.74230 – 7007800
44024020040024.940.74265 – 8007800
44025020050024.970.74330 – 10007800
44027020070025.020.74465 – 14007800
4402015200150025.120.741000 – 28507800
4402020200200025.090.741400 – 38007800
4402025200250025.000.741800 – 47507800
4402030200300024.840.742100 – 57007800
44154715047533.240.98320 – 95010400
44157015070033.300.98465 – 140010400
4415030150300033.410.982100 – 570010400
4415045150450032.900.983200 – 855010400
44016510065049.831.45430 – 130015600
44017010070049.851.45465 – 140015600
4401010100100049.941.45700 – 190015600
4401020100200050.151.451400 – 380015600
4401025100250050.211.451800 – 475015600
4401030100300050.241.452100 – 570015600
4401042100416050.171.453000 – 790015600
4401048100484050.051.453500 – 920015600
4401055100550049.861.453900 – 1050015600
4401062100620049.601.454400 – 1180015600
4401072100720049.101.455100 – 1370015600
4401088100875048.011.456200 – 1560015600
4401097100970047.131.456900 – 1560015600
44011031001030046.491.457300 – 1560015600
447507075700066.591.955000 – 1300020700
447509575950065.521.956800 – 1800020700
445001050100099.572.9700 – 190031000
4450038503800100.272.92700 – 720031000
4450063506300100.482.94500 – 1200031000
4450070507000100.462.95000 – 1330031000
4450083508300100.342.95900 – 1580031000
4450124501236099.222.98800 – 2350031000
4450169501690096.502.912000 – 3100031000
4450200502000093.632.914300 – 3100031000
443702837.52790133.23.92000 – 530042000
443705637.55570133.83.94000 – 1060042000
443709337.59260134.03.96600 – 1760042000
443715637.515600133.53.911100 – 2970042000
44241162411600209.36.38300 – 2200065000
44241442414400209.36.310300 – 2740065000
44241732417300209.06.312400 – 3290065000
44242432424300207.36.317400 – 4620065000
44242852428500205.46.320400 – 5420065000
44243252432500203.06.323200 – 6180065000

Gratings with line density 3600 mm-1

• Model 443600: blaze wavelength = hol; *reciprocal linear dispersion = 1.35** nm/mm; spectral resolution = 0.04 nm; operating wavelengths range = 185-430 nm; spectral range limited by the grating rotation angle = 430 nm.

Gratings with line density 2400 mm-1

• Model 442422: blaze wavelength = 225 nm; *reciprocal linear dispersion = 2.08 nm/mm; spectral resolution = 0.06 nm; operating wavelengths range = 185-450 nm; spectral range limited by the grating rotation angle = 650 nm.

• Model 442427: blaze wavelength = 270 nm; *reciprocal linear dispersion = 2.06 nm/mm; spectral resolution = 0.06 nm; operating wavelengths range = 185-540 nm; spectral range limited by the grating rotation angle = 650 nm.

• Model 442770: blaze wavelength = 400 nm; *reciprocal linear dispersion = 1.97 nm/mm; spectral resolution = 0.06 nm; operating wavelengths range = 265-650 nm; spectral range limited by the grating rotation angle = 650 nm.

Gratings with line density 1800 mm-1

• Model 441827: blaze wavelength = 270 nm; *reciprocal linear dispersion = 2.78 nm/mm; spectral resolution = 0.08 nm; operating wavelengths range = 185-540 nm; spectral range limited by the grating rotation angle = 870 nm.

• Model 441840: blaze wavelength = 400 nm; *reciprocal linear dispersion = 2.73 nm/mm; spectral resolution = 0.08 nm; operating wavelengths range = 265-800 nm; spectral range limited by the grating rotation angle = 870 nm.

• Model 441850: blaze wavelength = 500 nm; *reciprocal linear dispersion = 2.66 nm/mm; spectral resolution = 0.08 nm; operating wavelengths range = 330-870 nm; spectral range limited by the grating rotation angle = 870 nm.

• Model 441875: blaze wavelength = 750 nm; *reciprocal linear dispersion = 2.31 nm/mm; spectral resolution = 0.08 nm; operating wavelengths range = 500-870 nm; spectral range limited by the grating rotation angle = 870 nm.

Gratings with line density 1200 mm-1

• Model 441225: blaze wavelength = 250 nm; *reciprocal linear dispersion = 4.19 nm/mm; spectral resolution = 0.12 nm; operating wavelengths range = 185-500 nm; spectral range limited by the grating rotation angle = 1300 nm.

• Model 441228: blaze wavelength = 280 nm; *reciprocal linear dispersion = 4.19 nm/mm; spectral resolution = 0.12 nm; operating wavelengths range = 185-560 nm; spectral range limited by the grating rotation angle = 1300 nm.

• Model 441240: blaze wavelength = 400 nm; *reciprocal linear dispersion = 4.17 nm/mm; spectral resolution = 0.12 nm; operating wavelengths range = 265-800 nm; spectral range limited by the grating rotation angle = 1300 nm.

• Model 441250: blaze wavelength = 500 nm; *reciprocal linear dispersion = 4.14 nm/mm; spectral resolution = 0.12 nm; operating wavelengths range = 330-1000 nm; spectral range limited by the grating rotation angle = 1300 nm.

• Model 441260: blaze wavelength = 600 nm; *reciprocal linear dispersion = 4.09 nm/mm; spectral resolution = 0.12 nm; operating wavelengths range = 400-1200 nm; spectral range limited by the grating rotation angle = 1300 nm.

• Model 441275: blaze wavelength = 750 nm; *reciprocal linear dispersion = 3.98 nm/mm; spectral resolution = 0.12 nm; operating wavelengths range = 500-1300 nm; spectral range limited by the grating rotation angle = 1300 nm.

Gratings with line density 600 mm-1

• Model 440623: blaze wavelength = 230 nm; *reciprocal linear dispersion = 8.34 nm/mm; spectral resolution = 0.25 nm; operating wavelengths range = 185-460 nm; spectral range limited by the grating rotation angle = 2600 nm.

• Model 440630: blaze wavelength = 300 nm; *reciprocal linear dispersion = 8.35 nm/mm; spectral resolution = 0.25 nm; operating wavelengths range = 200-600 nm; spectral range limited by the grating rotation angle = 2600 nm.

• Model 440640: blaze wavelength = 400 nm; *reciprocal linear dispersion = 8.37 nm/mm; spectral resolution = 0.25 nm; operating wavelengths range = 265-800 nm; spectral range limited by the grating rotation angle = 2600 nm.

• Model 440650: blaze wavelength = 500 nm; *reciprocal linear dispersion = 8.37 nm/mm; spectral resolution = 0.25 nm; operating wavelengths range = 330-1000 nm; spectral range limited by the grating rotation angle = 2600 nm.

• Model 440660: blaze wavelength = 600 nm; *reciprocal linear dispersion = 8.37 nm/mm; spectral resolution = 0.25 nm; operating wavelengths range = 400-1200 nm; spectral range limited by the grating rotation angle = 2600 nm.

• Model 440675: blaze wavelength = 750 nm; *reciprocal linear dispersion = 8.35 nm/mm; spectral resolution = 0.25 nm; operating wavelengths range = 500-1500 nm; spectral range limited by the grating rotation angle = 2600 nm.

Gratings with line density 400 mm-1

• Model 440428: blaze wavelength = 280 nm; *reciprocal linear dispersion = 12.49 nm/mm; spectral resolution = 0.36 nm; operating wavelengths range = 185-560 nm; spectral range limited by the grating rotation angle = 3900 nm.

• Model 4404008: blaze wavelength = 800 nm; *reciprocal linear dispersion = 12.56 nm/mm; spectral resolution = 0.36 nm; operating wavelengths range = 570-1520 nm; spectral range limited by the grating rotation angle = 3900 nm.

• Model 4404012: blaze wavelength = 1200 nm; *reciprocal linear dispersion = 12.51 nm/mm; spectral resolution = 0.36 nm; operating wavelengths range = 800-2400 nm; spectral range limited by the grating rotation angle = 3900 nm.

• Model 4404017: blaze wavelength = 1700 nm; *reciprocal linear dispersion = 12.33 nm/mm; spectral resolution = 0.36 nm; operating wavelengths range = 1200-3200 nm; spectral range limited by the grating rotation angle = 3900 nm.

• Model 4404020: blaze wavelength = 2000 nm; *reciprocal linear dispersion = 12.15 nm/mm; spectral resolution = 0.36 nm; operating wavelengths range = 1400-3800 nm; spectral range limited by the grating rotation angle = 3900 nm.

• Model 4404025: blaze wavelength = 2500 nm; *reciprocal linear dispersion = 11.70 nm/mm; spectral resolution = 0.36 nm; operating wavelengths range = 1800-4750 nm; spectral range limited by the grating rotation angle = 3900 nm.

Gratings with line density 300 mm-1

• Model 440330: blaze wavelength = 300 nm; *reciprocal linear dispersion = 16.64 nm/mm; spectral resolution = 0.48 nm; operating wavelengths range = 200-600 nm; spectral range limited by the grating rotation angle = 5200 nm.

• Model 440335: blaze wavelength = 350 nm; *reciprocal linear dispersion = 16.65 nm/mm; spectral resolution = 0.48 nm; operating wavelengths range = 230-700 nm; spectral range limited by the grating rotation angle = 5200 nm.

• Model 440350: blaze wavelength = 500 nm; *reciprocal linear dispersion = 16.69 nm/mm; spectral resolution = 0.48 nm; operating wavelengths range = 330-1000 nm; spectral range limited by the grating rotation angle = 5200 nm.

• Model 440360: blaze wavelength = 600 nm; *reciprocal linear dispersion = 16.71 nm/mm; spectral resolution = 0.48 nm; operating wavelengths range = 400-1200 nm; spectral range limited by the grating rotation angle = 5200 nm.

• Model 440370: blaze wavelength = 700 nm; *reciprocal linear dispersion = 16.72 nm/mm; spectral resolution = 0.48 nm; operating wavelengths range = 465-1400 nm; spectral range limited by the grating rotation angle = 5200 nm.

• Model 4403010: blaze wavelength = 1000 nm; *reciprocal linear dispersion = 16.75 nm/mm; spectral resolution = 0.48 nm; operating wavelengths range = 700-1900 nm; spectral range limited by the grating rotation angle = 5200 nm.

• Model 4403015: blaze wavelength = 1500 nm; *reciprocal linear dispersion = 16.71 nm/mm; spectral resolution = 0.48 nm; operating wavelengths range = 1000-2850 nm; spectral range limited by the grating rotation angle = 5200 nm.

• Model 4403020: blaze wavelength = 2000 nm; *reciprocal linear dispersion = 16.56 nm/mm; spectral resolution = 0.48 nm; operating wavelengths range = 1400-3800 nm; spectral range limited by the grating rotation angle = 5200 nm.

• Model 4403030: blaze wavelength = 3000 nm; *reciprocal linear dispersion = 15.93 nm/mm; spectral resolution = 0.48 nm; operating wavelengths range = 2100-5200 nm; spectral range limited by the grating rotation angle = 5200 nm.

• Model 4403035: blaze wavelength = 3500 nm; *reciprocal linear dispersion = 15.42 nm/mm; spectral resolution = 0.48 nm; operating wavelengths range = 2500-5200 nm; spectral range limited by the grating rotation angle = 5200 nm.

Gratings with line density 200 mm-1

• Model 440235: blaze wavelength = 350 nm; *reciprocal linear dispersion = 24.93 nm/mm; spectral resolution = 0.74 nm; operating wavelengths range = 230-700 nm; spectral range limited by the grating rotation angle = 7800 nm.
• Model 440240: blaze wavelength = 400 nm; *reciprocal linear dispersion = 24.94 nm/mm; spectral resolution = 0.74 nm; operating wavelengths range = 265-800 nm; spectral range limited by the grating rotation angle = 7800 nm.
• Model 440250: blaze wavelength = 500 nm; *reciprocal linear dispersion = 24.97 nm/mm; spectral resolution = 0.74 nm; operating wavelengths range = 330-1000 nm; spectral range limited by the grating rotation angle = 7800 nm.
• Model 440270: blaze wavelength = 700 nm; *reciprocal linear dispersion = 25.02 nm/mm; spectral resolution = 0.74 nm; operating wavelengths range = 465-1400 nm; spectral range limited by the grating rotation angle = 7800 nm.
• Model 4402015: blaze wavelength = 1500 nm; *reciprocal linear dispersion = 25.12 nm/mm; spectral resolution = 0.74 nm; operating wavelengths range = 1000-2850 nm; spectral range limited by the grating rotation angle = 7800 nm.
• Model 4402020: blaze wavelength = 2000 nm; *reciprocal linear dispersion = 25.09 nm/mm; spectral resolution = 0.74 nm; operating wavelengths range = 1400-3800 nm; spectral range limited by the grating rotation angle = 7800 nm.
• Model 4402025: blaze wavelength = 2500 nm; *reciprocal linear dispersion = 25.00 nm/mm; spectral resolution = 0.74 nm; operating wavelengths range = 1800-4750 nm; spectral range limited by the grating rotation angle = 7800 nm.
• Model 4402030: blaze wavelength = 3000 nm; *reciprocal linear dispersion = 24.84 nm/mm; spectral resolution = 0.74 nm; operating wavelengths range = 2100-5700 nm; spectral range limited by the grating rotation angle = 7800 nm.

Gratings with line density 150 mm-1

• Model 441547: blaze wavelength = 475 nm; *reciprocal linear dispersion = 33.24 nm/mm; spectral resolution = 0.98 nm; operating wavelengths range = 320-950 nm; spectral range limited by the grating rotation angle = 10400 nm.
• Model 441570: blaze wavelength = 700 nm; *reciprocal linear dispersion = 33.30 nm/mm; spectral resolution = 0.98 nm; operating wavelengths range = 465-1400 nm; spectral range limited by the grating rotation angle = 10400 nm.
• Model 4415030: blaze wavelength = 3000 nm; *reciprocal linear dispersion = 33.41 nm/mm; spectral resolution = 0.98 nm; operating wavelengths range = 2100-5700 nm; spectral range limited by the grating rotation angle = 10400 nm.
• Model 4415045: blaze wavelength = 4500 nm; *reciprocal linear dispersion = 32.90 nm/mm; spectral resolution = 0.98 nm; operating wavelengths range = 3200-8550 nm; spectral range limited by the grating rotation angle = 10400 nm.

Gratings with line density 100 mm-1

• Model 440165: blaze wavelength = 650 nm; *reciprocal linear dispersion = 49.83 nm/mm; spectral resolution = 1.45 nm; operating wavelengths range = 430-1300 nm; spectral range limited by the grating rotation angle = 15600 nm.
• Model 440170: blaze wavelength = 700 nm; *reciprocal linear dispersion = 49.85 nm/mm; spectral resolution = 1.45 nm; operating wavelengths range = 465-1400 nm; spectral range limited by the grating rotation angle = 15600 nm.
• Model 4401010: blaze wavelength = 1000 nm; *reciprocal linear dispersion = 49.94 nm/mm; spectral resolution = 1.45 nm; operating wavelengths range = 700-1900 nm; spectral range limited by the grating rotation angle = 15600 nm.
• Model 4401020: blaze wavelength = 2000 nm; *reciprocal linear dispersion = 50.15 nm/mm; spectral resolution = 1.45 nm; operating wavelengths range = 1400-3800 nm; spectral range limited by the grating rotation angle = 15600 nm.
• Model 4401025: blaze wavelength = 2500 nm; *reciprocal linear dispersion = 50.21 nm/mm; spectral resolution = 1.45 nm; operating wavelengths range = 1800-4750 nm; spectral range limited by the grating rotation angle = 15600 nm.
• Model 4401030: blaze wavelength = 3000 nm; *reciprocal linear dispersion = 50.24 nm/mm; spectral resolution = 1.45 nm; operating wavelengths range = 2100-5700 nm; spectral range limited by the grating rotation angle = 15600 nm.
• Model 4401042: blaze wavelength = 4160 nm; *reciprocal linear dispersion = 50.17 nm/mm; spectral resolution = 1.45 nm; operating wavelengths range = 3000-7900 nm; spectral range limited by the grating rotation angle = 15600 nm.
• Model 4401048: blaze wavelength = 4840 nm; *reciprocal linear dispersion = 50.05 nm/mm; spectral resolution = 1.45 nm; operating wavelengths range = 3500-9200 nm; spectral range limited by the grating rotation angle = 15600 nm.
• Model 4401055: blaze wavelength = 5500 nm; *reciprocal linear dispersion = 49.86 nm/mm; spectral resolution = 1.45 nm; operating wavelengths range = 3900-10500 nm; spectral range limited by the grating rotation angle = 15600 nm.
• Model 4401062: blaze wavelength = 6200 nm; *reciprocal linear dispersion = 49.60 nm/mm; spectral resolution = 1.45 nm; operating wavelengths range = 4400-11800 nm; spectral range limited by the grating rotation angle = 15600 nm.
• Model 4401072: blaze wavelength = 7200 nm; *reciprocal linear dispersion = 49.10 nm/mm; spectral resolution = 1.45 nm; operating wavelengths range = 5100-13700 nm; spectral range limited by the grating rotation angle = 15600 nm.
• Model 4401088: blaze wavelength = 8750 nm; *reciprocal linear dispersion = 48.01 nm/mm; spectral resolution = 1.45 nm; operating wavelengths range = 6200-15600 nm; spectral range limited by the grating rotation angle = 15600 nm.
• Model 4401097: blaze wavelength = 9700 nm; *reciprocal linear dispersion = 47.13 nm/mm; spectral resolution = 1.45 nm; operating wavelengths range = 6900-15600 nm; spectral range limited by the grating rotation angle = 15600 nm.
• Model 4401103: blaze wavelength = 10300 nm; *reciprocal linear dispersion = 46.49 nm/mm; spectral resolution = 1.45 nm; operating wavelengths range = 7300-15600 nm; spectral range limited by the grating rotation angle = 15600 nm.

Gratings with line density 75 mm-1

• Model 4475070: blaze wavelength = 7000 nm; *reciprocal linear dispersion = 66.59 nm/mm; spectral resolution = 1.95 nm; operating wavelengths range = 5000-13000 nm; spectral range limited by the grating rotation angle = 20700 nm.
• Model 4475095: blaze wavelength = 9500 nm; *reciprocal linear dispersion = 65.52 nm/mm; spectral resolution = 1.95 nm; operating wavelengths range = 6800-18000 nm; spectral range limited by the grating rotation angle = 20700 nm.

Gratings with line density 50 mm-1

• Model 4450010: blaze wavelength = 1000 nm; *reciprocal linear dispersion = 99.57 nm/mm; spectral resolution = 2.9 nm; operating wavelengths range = 700-1900 nm; spectral range limited by the grating rotation angle = 31000 nm.
• Model 4450038: blaze wavelength = 3800 nm; *reciprocal linear dispersion = 100.27 nm/mm; spectral resolution = 2.9 nm; operating wavelengths range = 2700-7200 nm; spectral range limited by the grating rotation angle = 31000 nm.
• Model 4450063: blaze wavelength = 6300 nm; *reciprocal linear dispersion = 100.48 nm/mm; spectral resolution = 2.9 nm; operating wavelengths range = 4500-12000 nm; spectral range limited by the grating rotation angle = 31000 nm.
• Model 4450070: blaze wavelength = 7000 nm; *reciprocal linear dispersion = 100.46 nm/mm; spectral resolution = 2.9 nm; operating wavelengths range = 5000-13300 nm; spectral range limited by the grating rotation angle = 31000 nm.
• Model 4450083: blaze wavelength = 8300 nm; *reciprocal linear dispersion = 100.34 nm/mm; spectral resolution = 2.9 nm; operating wavelengths range = 5900-15800 nm; spectral range limited by the grating rotation angle = 31000 nm.
• Model 4450124: blaze wavelength = 12360 nm; *reciprocal linear dispersion = 99.22 nm/mm; spectral resolution = 2.9 nm; operating wavelengths range = 8800-23500 nm; spectral range limited by the grating rotation angle = 31000 nm.
• Model 4450169: blaze wavelength = 16900 nm; *reciprocal linear dispersion = 96.50 nm/mm; spectral resolution = 2.9 nm; operating wavelengths range = 12000-31000 nm; spectral range limited by the grating rotation angle = 31000 nm.
• Model 4450200: blaze wavelength = 20000 nm; *reciprocal linear dispersion = 93.63 nm/mm; spectral resolution = 2.9 nm; operating wavelengths range = 14300-31000 nm; spectral range limited by the grating rotation angle = 31000 nm.

Gratings with line density 37.5 mm-1

• Model 4437028: blaze wavelength = 2790 nm; *reciprocal linear dispersion = 133.2 nm/mm; spectral resolution = 3.9 nm; operating wavelengths range = 2000-5300 nm; spectral range limited by the grating rotation angle = 42000 nm.
• Model 4437056: blaze wavelength = 5570 nm; *reciprocal linear dispersion = 133.8 nm/mm; spectral resolution = 3.9 nm; operating wavelengths range = 4000-10600 nm; spectral range limited by the grating rotation angle = 42000 nm.
• Model 4437093: blaze wavelength = 9260 nm; *reciprocal linear dispersion = 134.0 nm/mm; spectral resolution = 3.9 nm; operating wavelengths range = 6600-17600 nm; spectral range limited by the grating rotation angle = 42000 nm.
• Model 4437156: blaze wavelength = 15600 nm; *reciprocal linear dispersion = 133.5 nm/mm; spectral resolution = 3.9 nm; operating wavelengths range = 11100-29700 nm; spectral range limited by the grating rotation angle = 42000 nm.

Gratings with line density 24 mm-1

• Model 4424116: blaze wavelength = 11600 nm; *reciprocal linear dispersion = 209.3 nm/mm; spectral resolution = 6.3 nm; operating wavelengths range = 8300-22000 nm; spectral range limited by the grating rotation angle = 65000 nm.
• Model 4424144: blaze wavelength = 14400 nm; *reciprocal linear dispersion = 209.3 nm/mm; spectral resolution = 6.3 nm; operating wavelengths range = 10300-27400 nm; spectral range limited by the grating rotation angle = 65000 nm.
• Model 4424173: blaze wavelength = 17300 nm; *reciprocal linear dispersion = 209.0 nm/mm; spectral resolution = 6.3 nm; operating wavelengths range = 12400-32900 nm; spectral range limited by the grating rotation angle = 65000 nm.
• Model 4424243: blaze wavelength = 24300 nm; *reciprocal linear dispersion = 207.3 nm/mm; spectral resolution = 6.3 nm; operating wavelengths range = 17400-46200 nm; spectral range limited by the grating rotation angle = 65000 nm.
• Model 4424285 blaze wavelength = 28500 nm; *reciprocal linear dispersion = 205.4 nm/mm; spectral resolution = 6.3 nm; operating wavelengths range = 20400-54200 nm; spectral range limited by the grating rotation angle = 65000 nm.
• Model 4424325 blaze wavelength = 32500 nm; *reciprocal linear dispersion = 203.0 nm/mm; spectral resolution = 6.3 nm; operating wavelengths range = 23200-61800 nm; spectral range limited by the grating rotation angle = 65000 nm.

* At the blaze wavelength.
** At the wavelength 225 nm.