Double monochromator MZDD350i

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While choosing a device configuration a proper selection of diffraction gratings is important. A proper selection of 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 MZDD350i.
Please, choose a necessary grating from the given below list, or consult our specialists.

 
SOL instruments: спектрометр, рамановский микроскоп, эмиссионный спектрометр. дифракционная решетка435х315

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

Model Line density,
mm-1
Blaze wavelength,
nm
 *Reciprocal linear dispersion,
nm/mm
Spectral resolution,
nm
Operating wavelengths range, nm 
Spectral range
limited by the grating rotation angle, nm
773600 3600 hol 0.76** 0.025  185 - 425  425
772422 2400 225 1.17 0.035  185 - 450  640 
772427 2400 270 1.16 0.035  185 - 540  640 
772770 2400 400 1.11 0.035  270 - 640  640 
771827 1800 270 1.57 0.04  185 - 540  860 
771840 1800 400 1.54 0.04  265 - 800  860 
771850 1800 500 1.49 0.04  330 - 860 860 
771875 1800 750 1.29 0.04  500 - 860 860 
771225 1200 250 2.36 0.07  185 - 500  1280 
771228 1200 280 2.36 0.07  185 - 560  1280 
771240 1200 400 2.35 0.07  265 - 800  1280 
771250 1200 500 2.33 0.07  330 - 1000  1280 
771260 1200 600 2.30 0.07  400 - 1200  1280 
771275 1200 750 2.24 0.07  500 - 1280 1280 
770623 600 230 4.72 0.14  185 - 460  2560 
770630 600 300 4.72 0.14  200 - 600  2560 
770640 600 400 4.73 0.14  265 - 800  2560 
770650 600 500 4.73 0.14  330 - 1000  2560 
770660 600 600 4.73 0.14  400 - 1200  2560 
770675 600 750 4.71 0.14  500 - 1500  2560 
7704008 400 800 7.09 0.21  540 - 1600  3840 
7704012 400 1200 7.06 0.21  800 - 2400 3840 
7704017 400 1700 6.94 0.21  1135 - 3400  3840 
7704020 400 2000 6.83 0.21  1335 - 3840 3840 
7704025 400 2500 6.57  0.21  1665 - 3840 3840 
770330 300 300 9.42 0.28  200 - 600  5120 
770335 300 350 9.42 0.28  235 - 700  5120 
770350 300 500 9.44 0.28  335 - 1000  5120 
770360 300 600 9.45 0.28  400 - 1200  5120 
770370 300 700 9.45 0.28  465 - 1400  5120 
7703010  300 1000 9.46 0.28  665 - 2000  5120 
7703015 300 1500 9.42 0.28  1000 - 3000  5120 
7703020 300 2000 9.33 0.28  1335 - 4000  5120 
7703030 300 3000 8.95 0.28  2000 - 5120 5120 
7703035 300 3500 8.65 0.28  2335 - 5120 5120 
770235 200 350 14.11 0.42  235 - 700  7680 
770240 200 400 14.12 0.42  265 - 800  7680 
770250 200 500 14.13 0.42  335 - 1000  7680 
770270 200 700 14.15 0.42  465 - 1400  7680 
7702015 200 1500 14.19 0.42  1000 - 3000  7680 
7702020 200 2000 14.16 0.42  1335 - 4000  7680 
7702025 200 2500 14.10 0.42  1665 - 5000  7680 
7702030 200 3000 14.00 0.42  2000 - 6000  7680 
771547 150 475 18.81 0.56  315 - 950  10300 
771570 150 700 18.85 0.56  465 - 1400  10300 
7715030 150 3000 18.85 0.56  2000 - 6000  10300 
7715045 150 4500 18.52 0.56  3000 - 9000  10300 
770165 100 650 28.21 0.84  435 - 1300  15400 
770170 100 700 28.22 0.84  465 - 1400  15400 
7701010 100 1000 28.26 0.84  665 - 2000  15400 
7701020 100 2000 28.36 0.84  1335 - 4000  15400 
7701025 100 2500 28.38 0.84  1665 - 5000  15400 
7701030 100 3000 28.38 0.84  2000 - 6000  15400 
7701042 100 4160 28.31 0.84  2800 - 8300  15400 
7701048 100 4840 28.23 0.84  3300 - 9600  15400 
7701055 100 5500 28.11 0.84  3700-11000  15400 
7701062 100 6200 27.94 0.84  4200-12400  15400 
7701072 100 7200 27.63 0.84  4900-14400  15400 
7701088 100 8750 26.98 0.84  5900-15400  15400 
7701097 100 9700 26.46 0.84  6500-15400  15400 
7701103 100 10300 26.09 0.84  6900-15400  15400 
7775070 75 7000 37.54 1.12  4700-14000  20600 
7775095 75 9500 36.88 1.12  6400-19000  20600 
7750010 50 1000 56.37 1.68  700-2000  31000 
7750038 50 3800 56.70 1.68  2700-7600  31000 
7750063 50 6300 56.75 1.68  4200-12600  31000 
7750070 50 7000 56.73 1.68  4700-14000  31000 
7750083 50 8300 56.63 1.68  5600-16600  31000 
7750124 50 12360 55.89 1.68  8300-24700  31000 
7750169 50 16900 54.25 1.68  11300-31000  31000 
7750200 50 20000 52.56 1.68  13400-31000  31000 
7737028 37.5 2790 75.38 2.24  1900-5500  41200 
7737056 37.5 5570 75.63 2.24  3700-11100  41200 
7737093 37.5 9260 75.64 2.24  6200-18500  41200 
7737156 37.5 15600 74.74 2.24  10400-31200  41200 
7724116 24 11600 118.25 3.5  7800-23200  64000 
7724144 24 14400 118.19 3.5  9600-28800  64000 
7724173 24 17300 117.97 3.5  11600-34600  64000 
7724243 24 24300 116.81 3.5  16200-48600  64000 
7724285 24 28500 115.65 3.5  19000-57000  64000 
7724325 24 32500 114.20 3.5  21700-63000  64000 

 

 * For the 1st monochromator at the blaze wavelength

** at the wavelength 225 nm