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 MS350 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
7736003600hol0.76**0.025185 – 425425
77242224002251.170.035185 – 450640
77242724002701.160.035185 – 540640
77277024004001.110.035270 – 640640
77182718002701.570.04185 – 540860
77184018004001.540.04265 – 800860
77185018005001.490.04330 – 860860
77187518007501.290.04500 – 860860
77122512002502.360.07185 – 5001280
77122812002802.360.07185 – 5601280
77124012004002.350.07265 – 8001280
77125012005002.330.07330 – 10001280
77126012006002.300.07400 – 12001280
77127512007502.240.07500 – 12801280
7706236002304.720.14185 – 4602560
7706306003004.720.14200 – 6002560
7706406004004.730.14265 – 8002560
7706506005004.730.14330 – 10002560
7706606006004.730.14400 – 12002560
7706756007504.710.14500 – 15002560
77040084008007.090.21540 – 16003840
770401240012007.060.21800 – 24003840
770401740017006.940.211135 – 34003840
770402040020006.830.211335 – 38403840
770402540025006.570.211665 – 38403840
7703303003009.420.28200 – 6005120
7703353003509.420.28235 – 7005120
7703503005009.440.28335 – 10005120
7703603006009.450.28400 – 12005120
7703703007009.450.28465 – 14005120
770301030010009.460.28665 – 20005120
770301530015009.420.281000 – 30005120
770302030020009.330.281335 – 40005120
770303030030008.950.282000 – 51205120
770303530035008.650.282335 – 51205120
77023520035014.110.42235 – 7007680
77024020040014.120.42265 – 8007680
77025020050014.130.42335 – 10007680
77027020070014.150.42465 – 14007680
7702015200150014.190.421000 – 30007680
7702020200200014.160.421335 – 40007680
7702025200250014.100.421665 – 50007680
7702030200300014.000.422000 – 60007680
77154715047518.810.56315 – 95010300
77157015070018.850.56465 – 140010300
7715030150300018.850.562000 – 600010300
7715045150450018.520.563000 – 900010300
77016510065028.210.84435 – 130015400
77017010070028.220.84465 – 140015400
7701010100100028.260.84665 – 200015400
7701020100200028.360.841335 – 400015400
7701025100250028.380.841665 – 500015400
7701030100300028.380.842000 – 600015400
7701042100416028.310.842800 – 830015400
7701048100484028.230.843300 – 960015400
7701055100550028.110.843700 – 1100015400
7701062100620027.940.844200 – 1240015400
7701072100720027.630.844900 – 1440015400
7701088100875026.980.845900 – 1540015400
7701097100970026.460.846500 – 1540015400
77011031001030026.090.846900 – 1540015400
777507075700037.541.124700 – 1400020600
777509575950036.881.126400 – 1900020600
775001050100056.371.68700 – 200031000
775003850380056.701.682700 – 760031000
775006350630056.751.684200 – 1260031000
775007050700056.731.684700 – 1400031000
775008350830056.631.685600 – 1660031000
7750124501236055.891.688300 – 2470031000
7750169501690054.251.6811300 – 3100031000
7750200502000052.561.6813400 – 3100031000
773702837.5279075.382.241900 – 550041200
773705637.5557075.632.243700 – 1110041200
773709337.5926075.642.246200 – 1850041200
773715637.51560074.742.2410400 – 3120041200
77241162411600118.253.57800 – 2320064000
77241442414400118.193.59600 – 2880064000
77241732417300117.973.511600 – 3460064000
77242432424300116.813.516200 – 4860064000
77242852428500115.653.519000 – 5700064000
77243252432500114.203.521700 – 6300064000

Gratings with line density 3600 mm-1

• Model 773600: blaze wavelength = hol; *reciprocal linear dispersion = 0.76** nm/mm; spectral resolution = 0.025 nm; operating wavelengths range = 185-425 nm; spectral range limited by the grating rotation angle = 425 nm.

Gratings with line density 2400 mm-1

• Model 772422: blaze wavelength = 225 nm; *reciprocal linear dispersion = 1.17 nm/mm; spectral resolution = 0.035 nm; operating wavelengths range = 185-450 nm; spectral range limited by the grating rotation angle = 640 nm.
• Model 772427: blaze wavelength = 270 nm; *reciprocal linear dispersion = 1.16 nm/mm; spectral resolution = 0.035 nm; operating wavelengths range = 185-540 nm; spectral range limited by the grating rotation angle = 640 nm.
• Model 772770: blaze wavelength = 400 nm; *reciprocal linear dispersion = 1.11 nm/mm; spectral resolution = 0.035 nm; operating wavelengths range = 270-640 nm; spectral range limited by the grating rotation angle = 640 nm.

Gratings with line density 1800 mm-1

• Model 771827: blaze wavelength = 270 nm; *reciprocal linear dispersion = 1.57 nm/mm; spectral resolution = 0.04 nm; operating wavelengths range = 185-540 nm; spectral range limited by the grating rotation angle = 860 nm.
• Model 771840: blaze wavelength = 400 nm; *reciprocal linear dispersion = 1.54 nm/mm; spectral resolution = 0.04 nm; operating wavelengths range = 265-800 nm; spectral range limited by the grating rotation angle = 860 nm.
• Model 771850: blaze wavelength = 500 nm; *reciprocal linear dispersion = 1.49 nm/mm; spectral resolution = 0.04 nm; operating wavelengths range = 330-860 nm; spectral range limited by the grating rotation angle = 860 nm.
• Model 771875: blaze wavelength = 750 nm; *reciprocal linear dispersion = 1.29 nm/mm; spectral resolution = 0.04 nm; operating wavelengths range = 500-860 nm; spectral range limited by the grating rotation angle = 860 nm.

Gratings with line density 1200 mm-1

• Model 771225: blaze wavelength = 250 nm; *reciprocal linear dispersion = 2.36 nm/mm; spectral resolution = 0.07 nm; operating wavelengths range = 185-500 nm; spectral range limited by the grating rotation angle = 1280 nm.
• Model 771228: blaze wavelength = 280 nm; *reciprocal linear dispersion = 2.36 nm/mm; spectral resolution = 0.07 nm; operating wavelengths range = 185-560 nm; spectral range limited by the grating rotation angle = 1280 nm.
• Model 771240: blaze wavelength = 400 nm; *reciprocal linear dispersion = 2.35 nm/mm; spectral resolution = 0.07 nm; operating wavelengths range = 265-800 nm; spectral range limited by the grating rotation angle = 1280 nm.
• Model 771250: blaze wavelength = 500 nm; *reciprocal linear dispersion = 2.33 nm/mm; spectral resolution = 0.07 nm; operating wavelengths range = 330-1000 nm; spectral range limited by the grating rotation angle = 1280 nm.
• Model 771260: blaze wavelength = 600 nm; *reciprocal linear dispersion = 2.30 nm/mm; spectral resolution = 0.07 nm; operating wavelengths range = 400-1200 nm; spectral range limited by the grating rotation angle = 1280 nm.
• Model 771275: blaze wavelength = 750 nm; *reciprocal linear dispersion = 2.24 nm/mm; spectral resolution = 0.07 nm; operating wavelengths range = 500-1280 nm; spectral range limited by the grating rotation angle = 1280 nm.

Gratings with line density 600 mm-1

• Model 770623: blaze wavelength = 230 nm; *reciprocal linear dispersion = 4.72 nm/mm; spectral resolution = 0.14 nm; operating wavelengths range = 185-460 nm; spectral range limited by the grating rotation angle = 2560 nm.
• Model 770630: blaze wavelength = 300 nm; *reciprocal linear dispersion = 4.72 nm/mm; spectral resolution = 0.14 nm; operating wavelengths range = 200-600 nm; spectral range limited by the grating rotation angle = 2560 nm.
• Model 770640: blaze wavelength = 400 nm; *reciprocal linear dispersion = 4.73 nm/mm; spectral resolution = 0.14 nm; operating wavelengths range = 265-800 nm; spectral range limited by the grating rotation angle = 2560 nm.
• Model 770650: blaze wavelength = 500 nm; *reciprocal linear dispersion = 4.73 nm/mm; spectral resolution = 0.14 nm; operating wavelengths range = 330-1000 nm; spectral range limited by the grating rotation angle = 2560 nm.
• Model 770660: blaze wavelength = 600 nm; *reciprocal linear dispersion = 4.73 nm/mm; spectral resolution = 0.14 nm; operating wavelengths range = 400-1200 nm; spectral range limited by the grating rotation angle = 2560 nm.
• Model 770675: blaze wavelength = 750 nm; *reciprocal linear dispersion = 4.71 nm/mm; spectral resolution = 0.14 nm; operating wavelengths range = 500-1500 nm; spectral range limited by the grating rotation angle = 2560 nm.

Gratings with line density 400 mm-1

• Model 7704008: blaze wavelength = 800 nm; *reciprocal linear dispersion = 7.09 nm/mm; spectral resolution = 0.21 nm; operating wavelengths range = 540-1600 nm; spectral range limited by the grating rotation angle = 3840 nm.
• Model 7704012: blaze wavelength = 1200 nm; *reciprocal linear dispersion = 7.06 nm/mm; spectral resolution = 0.21 nm; operating wavelengths range = 800-2400 nm; spectral range limited by the grating rotation angle = 3840 nm.
• Model 7704017: blaze wavelength = 1700 nm; *reciprocal linear dispersion = 6.94 nm/mm; spectral resolution = 0.21 nm; operating wavelengths range = 1135-3400 nm; spectral range limited by the grating rotation angle = 3840 nm.
• Model 7704020: blaze wavelength = 2000 nm; *reciprocal linear dispersion = 6.83 nm/mm; spectral resolution = 0.21 nm; operating wavelengths range = 1335-3840 nm; spectral range limited by the grating rotation angle = 3840 nm.
• Model 7704025: blaze wavelength = 2500 nm; *reciprocal linear dispersion = 6.57 nm/mm; spectral resolution = 0.21 nm; operating wavelengths range = 1665-3840 nm; spectral range limited by the grating rotation angle = 3840 nm.

Gratings with line density 300 mm-1

• Model 770330: blaze wavelength = 300 nm; *reciprocal linear dispersion = 9.42 nm/mm; spectral resolution = 0.28 nm; operating wavelengths range = 200-600 nm; spectral range limited by the grating rotation angle = 5120 nm.
• Model 770335: blaze wavelength = 350 nm; *reciprocal linear dispersion = 9.42 nm/mm; spectral resolution = 0.28 nm; operating wavelengths range = 235-700 nm; spectral range limited by the grating rotation angle = 5120 nm.
• Model 770350: blaze wavelength = 500 nm; *reciprocal linear dispersion = 9.44 nm/mm; spectral resolution = 0.28 nm; operating wavelengths range = 335-1000 nm; spectral range limited by the grating rotation angle = 5120 nm.
• Model 770360: blaze wavelength = 600 nm; *reciprocal linear dispersion = 9.45 nm/mm; spectral resolution = 0.28 nm; operating wavelengths range = 400-1200 nm; spectral range limited by the grating rotation angle = 5120 nm.
• Model 770370: blaze wavelength = 700 nm; *reciprocal linear dispersion = 9.45 nm/mm; spectral resolution = 0.28 nm; operating wavelengths range = 465-1400 nm; spectral range limited by the grating rotation angle = 5120 nm.
• Model 7703010: blaze wavelength = 1000 nm; *reciprocal linear dispersion = 9.46 nm/mm; spectral resolution = 0.28 nm; operating wavelengths range = 665-2000 nm; spectral range limited by the grating rotation angle = 5120 nm.
• Model 7703015: blaze wavelength = 1500 nm; *reciprocal linear dispersion = 9.42 nm/mm; spectral resolution = 0.28 nm; operating wavelengths range = 1000-3000 nm; spectral range limited by the grating rotation angle = 5120 nm.
• Model 7703020: blaze wavelength = 2000 nm; *reciprocal linear dispersion = 9.33 nm/mm; spectral resolution = 0.28 nm; operating wavelengths range = 1335-4000 nm; spectral range limited by the grating rotation angle = 5120 nm.
• Model 7703030: blaze wavelength = 3000 nm; *reciprocal linear dispersion = 8.95 nm/mm; spectral resolution = 0.28 nm; operating wavelengths range = 2000-5120 nm; spectral range limited by the grating rotation angle = 5120 nm.
• Model 7703035: blaze wavelength = 3500 nm; *reciprocal linear dispersion = 8.65 nm/mm; spectral resolution = 0.28 nm; operating wavelengths range = 2335-5120 nm; spectral range limited by the grating rotation angle = 5120 nm.

Gratings with line density 200 mm-1

• Model 770235: blaze wavelength = 350 nm; *reciprocal linear dispersion = 14.11 nm/mm; spectral resolution = 0.42 nm; operating wavelengths range = 235-700 nm; spectral range limited by the grating rotation angle = 7680 nm.
• Model 770240: blaze wavelength = 400 nm; *reciprocal linear dispersion = 14.12 nm/mm; spectral resolution = 0.42 nm; operating wavelengths range = 265-800 nm; spectral range limited by the grating rotation angle = 7680 nm.
• Model 770250: blaze wavelength = 500 nm; *reciprocal linear dispersion = 14.13 nm/mm; spectral resolution = 0.42 nm; operating wavelengths range = 335-1000 nm; spectral range limited by the grating rotation angle = 7680 nm.
• Model 770270: blaze wavelength = 700 nm; *reciprocal linear dispersion = 14.15 nm/mm; spectral resolution = 0.42 nm; operating wavelengths range = 465-1400 nm; spectral range limited by the grating rotation angle = 7680 nm.
• Model 7702015: blaze wavelength = 1500 nm; *reciprocal linear dispersion = 14.19 nm/mm; spectral resolution = 0.42 nm; operating wavelengths range = 1000-3000 nm; spectral range limited by the grating rotation angle = 7680 nm.
• Model 7702020: blaze wavelength = 2000 nm; *reciprocal linear dispersion = 14.16 nm/mm; spectral resolution = 0.42 nm; operating wavelengths range = 1335-4000 nm; spectral range limited by the grating rotation angle = 7680 nm.
• Model 7702025: blaze wavelength = 2500 nm; *reciprocal linear dispersion = 14.10 nm/mm; spectral resolution = 0.42 nm; operating wavelengths range = 1665-5000 nm; spectral range limited by the grating rotation angle = 7680 nm.
• Model 7702030: blaze wavelength = 3000 nm; *reciprocal linear dispersion = 14.00 nm/mm; spectral resolution = 0.42 nm; operating wavelengths range = 2000-6000 nm; spectral range limited by the grating rotation angle = 7680 nm.

Gratings with line density 150 mm-1

• Model 771547: blaze wavelength = 475 nm; *reciprocal linear dispersion = 18.81 nm/mm; spectral resolution = 0.56 nm; operating wavelengths range = 315-950 nm; spectral range limited by the grating rotation angle = 10300 nm.
• Model 771570: blaze wavelength = 700 nm; *reciprocal linear dispersion = 18.85 nm/mm; spectral resolution = 0.56 nm; operating wavelengths range = 465-1400 nm; spectral range limited by the grating rotation angle = 10300 nm.
• Model 7715030: blaze wavelength = 3000 nm; *reciprocal linear dispersion = 18.85 nm/mm; spectral resolution = 0.56 nm; operating wavelengths range = 2000-6000 nm; spectral range limited by the grating rotation angle = 10300 nm.
• Model 7715045: blaze wavelength = 4500 nm; *reciprocal linear dispersion = 18.52 nm/mm; spectral resolution = 0.56 nm; operating wavelengths range = 3000-9000 nm; spectral range limited by the grating rotation angle = 10300 nm.

Gratings with line density 100 mm-1

• Model 770165: blaze wavelength = 650 nm; *reciprocal linear dispersion = 28.21 nm/mm; spectral resolution = 0.84 nm; operating wavelengths range = 435-1300 nm; spectral range limited by the grating rotation angle = 15400 nm.
• Model 770170: blaze wavelength = 700 nm; *reciprocal linear dispersion = 28.22 nm/mm; spectral resolution = 0.84 nm; operating wavelengths range = 465-1400 nm; spectral range limited by the grating rotation angle = 15400 nm.
• Model 7701010: blaze wavelength = 1000 nm; *reciprocal linear dispersion = 28.26 nm/mm; spectral resolution = 0.84 nm; operating wavelengths range = 665-2000 nm; spectral range limited by the grating rotation angle = 15400 nm.
• Model 7701020: blaze wavelength = 2000 nm; *reciprocal linear dispersion = 28.36 nm/mm; spectral resolution = 0.84 nm; operating wavelengths range = 1335-4000 nm; spectral range limited by the grating rotation angle = 15400 nm.
• Model 7701025: blaze wavelength = 2500 nm; *reciprocal linear dispersion = 28.38 nm/mm; spectral resolution = 0.84 nm; operating wavelengths range = 1665-5000 nm; spectral range limited by the grating rotation angle = 15400 nm.
• Model 7701030: blaze wavelength = 3000 nm; *reciprocal linear dispersion = 28.38 nm/mm; spectral resolution = 0.84 nm; operating wavelengths range = 2000-6000 nm; spectral range limited by the grating rotation angle = 15400 nm.
• Model 7701042: blaze wavelength = 4160 nm; *reciprocal linear dispersion = 28.31 nm/mm; spectral resolution = 0.84 nm; operating wavelengths range = 2800-8300 nm; spectral range limited by the grating rotation angle = 15400 nm.
• Model 7701048: blaze wavelength = 4840 nm; *reciprocal linear dispersion = 28.23 nm/mm; spectral resolution = 0.84 nm; operating wavelengths range = 3300-9600 nm; spectral range limited by the grating rotation angle = 15400 nm.
• Model 7701055: blaze wavelength = 5500 nm; *reciprocal linear dispersion = 28.11 nm/mm; spectral resolution = 0.84 nm; operating wavelengths range = 3700-11000 nm; spectral range limited by the grating rotation angle = 15400 nm.
• Model 7701062: blaze wavelength = 6200 nm; *reciprocal linear dispersion = 27.94 nm/mm; spectral resolution = 0.84 nm; operating wavelengths range = 4200-12400 nm; spectral range limited by the grating rotation angle = 15400 nm.
• Model 7701072: blaze wavelength = 7200 nm; *reciprocal linear dispersion = 27.63 nm/mm; spectral resolution = 0.84 nm; operating wavelengths range = 4900-14400 nm; spectral range limited by the grating rotation angle = 15400 nm.
• Model 7701088: blaze wavelength = 8750 nm; *reciprocal linear dispersion = 26.98 nm/mm; spectral resolution = 0.84 nm; operating wavelengths range = 5900-15400 nm; spectral range limited by the grating rotation angle = 15400 nm.
• Model 7701097: blaze wavelength = 9700 nm; *reciprocal linear dispersion = 26.46 nm/mm; spectral resolution = 0.84 nm; operating wavelengths range = 6500-15400 nm; spectral range limited by the grating rotation angle = 15400 nm.
• Model 7701103: blaze wavelength = 10300 nm; *reciprocal linear dispersion = 26.09 nm/mm; spectral resolution = 0.84 nm; operating wavelengths range = 6900-15400 nm; spectral range limited by the grating rotation angle = 15400 nm.

Gratings with line density 75 mm-1

• Model 7775070: blaze wavelength = 7000 nm; *reciprocal linear dispersion = 37.54 nm/mm; spectral resolution = 1.12 nm; operating wavelengths range = 4700-14000 nm; spectral range limited by the grating rotation angle = 20600 nm.
• Model 7775095: blaze wavelength = 9500 nm; *reciprocal linear dispersion = 36.88 nm/mm; spectral resolution = 1.12 nm; operating wavelengths range = 6400-19000 nm; spectral range limited by the grating rotation angle = 20600 nm.

Gratings with line density 50 mm-1

• Model 7750010: blaze wavelength = 1000 nm; *reciprocal linear dispersion = 56.37 nm/mm; spectral resolution = 1.68 nm; operating wavelengths range = 700-2000 nm; spectral range limited by the grating rotation angle = 31000 nm.
• Model 7750038: blaze wavelength = 3800 nm; *reciprocal linear dispersion = 56.70 nm/mm; spectral resolution = 1.68 nm; operating wavelengths range = 2700-7600 nm; spectral range limited by the grating rotation angle = 31000 nm.
• Model 7750063: blaze wavelength = 6300 nm; *reciprocal linear dispersion = 56.75 nm/mm; spectral resolution = 1.68 nm; operating wavelengths range = 4200-12600 nm; spectral range limited by the grating rotation angle = 31000 nm.
• Model 7750070: blaze wavelength = 7000 nm; *reciprocal linear dispersion = 56.73 nm/mm; spectral resolution = 1.68 nm; operating wavelengths range = 4700-14000 nm; spectral range limited by the grating rotation angle = 31000 nm.
• Model 7750083: blaze wavelength = 8300 nm; *reciprocal linear dispersion = 56.63 nm/mm; spectral resolution = 1.68 nm; operating wavelengths range = 5600-16600 nm; spectral range limited by the grating rotation angle = 31000 nm.
• Model 7750124: blaze wavelength = 12360 nm; *reciprocal linear dispersion = 55.89 nm/mm; spectral resolution = 1.68 nm; operating wavelengths range = 8300-24700 nm; spectral range limited by the grating rotation angle = 31000 nm.
• Model 7750169: blaze wavelength = 16900 nm; *reciprocal linear dispersion = 54.25 nm/mm; spectral resolution = 1.68 nm; operating wavelengths range = 11300-31000 nm; spectral range limited by the grating rotation angle = 31000 nm.
• Model 7750200: blaze wavelength = 20000 nm; *reciprocal linear dispersion = 52.56 nm/mm; spectral resolution = 1.68 nm; operating wavelengths range = 13400-31000 nm; spectral range limited by the grating rotation angle = 31000 nm.

Gratings with line density 37.5 mm-1

• Model 7737028: blaze wavelength = 2790 nm; *reciprocal linear dispersion = 75.38 nm/mm; spectral resolution = 2.24 nm; operating wavelengths range = 1900-5500 nm; spectral range limited by the grating rotation angle = 41200 nm.
• Model 7737056: blaze wavelength = 5570 nm; *reciprocal linear dispersion = 75.63 nm/mm; spectral resolution = 2.24 nm; operating wavelengths range = 3700-11100 nm; spectral range limited by the grating rotation angle = 41200 nm.
• Model 7737093: blaze wavelength = 9260 nm; *reciprocal linear dispersion = 75.64 nm/mm; spectral resolution = 2.24 nm; operating wavelengths range = 6200-18500 nm; spectral range limited by the grating rotation angle = 41200 nm.
• Model 7737156: blaze wavelength = 15600 nm; *reciprocal linear dispersion = 74.74 nm/mm; spectral resolution = 2.24 nm; operating wavelengths range = 10400-31200 nm; spectral range limited by the grating rotation angle = 41200 nm.

Gratings with line density 24 mm-1

• Model 7724116: blaze wavelength = 11600 nm; *reciprocal linear dispersion = 118.25 nm/mm; spectral resolution = 3.5 nm; operating wavelengths range = 7800-23200 nm; spectral range limited by the grating rotation angle = 64000 nm.
• Model 7724144: blaze wavelength = 14400 nm; *reciprocal linear dispersion = 118.19 nm/mm; spectral resolution = 3.5 nm; operating wavelengths range = 9600-28800 nm; spectral range limited by the grating rotation angle = 64000 nm.
• Model 7724173: blaze wavelength = 17300 nm; *reciprocal linear dispersion = 117.97 nm/mm; spectral resolution = 3.5 nm; operating wavelengths range = 11600-34600 nm; spectral range limited by the grating rotation angle = 64000 nm.
• Model 7724243: blaze wavelength = 24300 nm; *reciprocal linear dispersion = 116.81 nm/mm; spectral resolution = 3.5 nm; operating wavelengths range = 16200-48600 nm; spectral range limited by the grating rotation angle = 64000 nm.
• Model 7724285: blaze wavelength = 28500 nm; *reciprocal linear dispersion = 115.65 nm/mm; spectral resolution = 3.5 nm; operating wavelengths range = 19000-57000 nm; spectral range limited by the grating rotation angle = 64000 nm.
• Model 7724325: blaze wavelength = 32500 nm; *reciprocal linear dispersion = 114.20 nm/mm; spectral resolution = 3.5 nm; operating wavelengths range = 21700-63000 nm; spectral range limited by the grating rotation angle = 64000 nm.

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