Description
| Monochromator-spectrograph MS520 series have a unique combination of high-intensity, accuracy and spectral resolution. Large angle of rotation of the grating allows to use Echelle grating, providing extremely high spectral resolution (up to 0.002 nm), as well as extended operating wavelength range for the other gratings.
MS520 are completely automated spectral devices with focal length of 520 mm and F-number of 1/5.4. High-quality optics and wide choice of diffraction gratings provide devices operation in a wide range from 185 nm up to 60 µm (depending on the selected grating).
M520 Series monochromator-spectrographs are based on Cherny–Turner asymmetric scheme that allows to minimize of aberrations and exclude spectra re-entrance from diffraction gratings and mirrors. Model MS5201i and model MS5204i have the astigmatism-correctedoptics what makes these devices applicable in multi-channel spectroscopy. Monochromators–spectrographs of MS520 series have one input port and two output ports. Selection of an output port is realized with an automated mirror. Either output spectral slits or multi-channel detectors can be installed on each of the output ports. We offer monochromators–spectrographs of MS520 Series with two types of input and output spectral slits: manual, operated with a micrometer screw and automated (combined), when the slit width is operated automatically or manually (with micrometer).
A wide choice of changeable gratings gives the best combination of high energetic efficiency and maximal spectral resolution for different spectrum areas. We also offer a wide range of additional accessories for Monochromators–spectrographs of MS350 series: Filter Wheel FWS-8A, -6A, Fast shutters, Fiber optics with adapters, input and output Condensres, Detectors and etc. Extremely high spectral resolution – 0,0020nm for Echelle grating 75 grooves/mm – in combination with small size and a variety of configurations and accessories make monochromators-spectrographs of MS520 series ideal devices for high resolution spectroscopy and Raman spectroscopy. High optical throughput makes it essential for luminescent investigations. |
I M A G I N G
Theory & Instructions |
Monochromator-spectrograph MS520 series, models
| MS5201 | MS5201i | MS5204 | MS5204i | |
| Diffraction unit | Single-position holder for manually changeable gratings | Single-position holder for manually changeable gratings | Four–grating turret | Four–grating turret |
| Optics | Standard | Imaging | Standard | Imaging |
In the devices with the standard optics (model MS5201 and model MS5204) a flat entrance deflecting mirror is used, and in the astigmatism–compensated devices (model MS5201i and model MS5204i) a cylindrical mirror is used as an entrance deflecting.
As well as in all Czerny–Turner design spectral devices, in the MS520 series an axis of the diffraction gratings rotation goes through the center of grating operating surface and coincides with the direction of grooves. This fact provides the stability of the geometry of the beams for formation of a flat and fixed focal field. The image quality in the whole flat focal field is optimized due to the use of an asymmetric scheme and use of a focusing large-size mirror allows one to use the whole focal field width without vignetting. Besides, Cherny–Turner asymmetric scheme provides a low level stray light and light re-entrance from the optical elements and detectors can be avoided.
In MS5204 and MS5204i the gratings rotation axes are arranged perpendicular to the spectrum scanning axis, providing a high repeatability of wavelength setting at replacing of gratings.
Specification
Optical system
| Optical scheme: | Cherny–Turner (astigmatism–compensated in model MS5201i and model MS5204i) |
| Ports: | 1 input, 2 output |
| Wavelength range: | 185 nm – 60 µm (depends on the type of grating) |
| F/number (entrance): | 5.4 |
| Focal length (output): | 520 mm |
| Scanning range limited by the grating rotation angle: | 0-1580 nm (grating 1200 l/mm) |
| Main mirrors: | spherical |
| Stray light: | 1х10-6 (20 nm from laser line 632.8 nm) |
| Focal plane: | 28 х 10 mm |
Optical scheme is optimized for:
- minimization of coma aberration over the whole operating spectral range
- elimination of the light re-entrance from two basic mirrors
- elimination of the light re-entrance between mirrors of the instrument and input windows of the detectors in the focal plane
- a large plane focal field for the whole operating spectral range
- astigmatism compensation for the whole operating spectral range by means of special correcting optics (for imaging modifications MS5204i and MS5201i)
Imaging
| Model: | MS5201 | MS5204 | MS5201i | MS5204i |
| Horizontal magnification: | 1.07 | 1.07 | 1.07 | 1.07 |
| Vertical magnification: | – | – | 1.29 | 1.29 |
| Vertical spatial resolution (minimal distance between the edges of the two nearby tracks (in multichannel spectroscopy)): |
– | – | <20 µm | <20 µm |
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Spectral image obtained with imaging monochromator-spectrograph MS5204i (grating 1800 l/mm,
light source – mercury-neon lamp, multi-channel fiber bundle, fiber core diameter 200µm, CCD pixel size 24×24 µm).
Drive
| Motor: | stepper, with fractional steps |
| Drive: | sine |
| Step size: | 0.22 arc seconds |
| Precision: | ± 1 step |
| Max. speed: | 10000 steps/s |
Optics
| Type of grating: | 1200 l/mm, λ = 546 nm |
Echelle, 75 l/mm, λ = 200 nm, 120 order |
| Reciprocal linear dispersion: | 1.55 nm/mm | 0.11 nm/mm |
| Spectral resolution: | ||
| – PMT (slit width 10 µm): | 0.028 nm | 0.0020 nm |
| – digital cameras (12 µm pixel): | 0.034 nm | 0.0024 nm |
| Repeatability: | ± 0.007 nm | ± 0.0009 nm |
| Wavelength accuracy: | ± 0.034 nm | ± 0.0044 nm |
| Average scanning step: | 0.0017 nm | – |
| Scanning step at 200 nm: | – | 2.25 x 10-4 nm |
Gratings
| Size: | 80 x 70 x 10 mm | |
| Rotation: | About the center of grating working surface | |
| Mounting: | Automated 4-grating turret (models MS5204, MS5204i) |
Positioner for 1 manually changeable grating models MS5201, MS5201i) |
| Grating repeatability: | ||
| – *wavelength: | ± 0.02 nm | ± 0.05 nm |
| – vertical image: | ± 50 µm | ± 75 µm |
* For grating 1200 l/mm, wavelength 546 nm
Ports
| Number: | 1 input, 2 output |
| *Output port repeatability (automated mirror): | ± 0.03 nm |
| Switching time (output port): | 4 s |
* For grating 1200 l/mm, wavelength 546 nm
Spectral slits
| Type of spectral slit: | Automated (combined) | Manual |
| Control: | Automated (drive) or manually (micrometer) | manually (micrometer) |
| Width: | Regulated from 0 up to 2.0 mm | Regulated from 0 up to 2.0 mm |
| Parallelism: | ± 1 µm | ± 1 µm |
| Accuracy (slit 1 mm): | ± 10 µm | ± 10 µm |
| Repeatability: | ± 1 µm | ± 1.5 µm |
| Reading accuracy (micrometer): | 2 µm | 2 µm |
| Step size (automated slit): | 0.5 µm | – |
| Height: | Diaphragm-regulated from 0 up to 10 mm (as option) | Diaphragm-regulated from 0 up to 10 mm (as option) |
Integrated shutter
| Shut time: | ~100 ms |
| Max. frequency: | 1 Hz |
| Control: | On-board CPU or TTL-signals from the external device |
Control
| Central: | on-board CPU |
| External: | PC |
| External interface: | Ethernet |
Dimensions
| Overall sizes (LхWхH): | 635 х 339 х 270 mm |
| Weight: | 25 kg (may vary, depends on the configuration) |
Configuration
| MS520 Series monochromators-spectrographs are compact general-purpose spectral devices, which posses an unique combination of the extra-high spectral resolution due to using Eschelle grating and the high throughput.
We propose several configurations, a wide choice of diffraction gratings, a great number of accessories and two types of the software for realization of different spectroscopy tasks: as the unique tasks which require high spectral resolution or any routin measurements. You have a possibility to choose a necessary device configuration depending on your task to be solved from the given below list or consult our specialists |
You can choose:
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Housing options:
With interference optics for all options of the housing, on request
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MS520 series monochromators–spectrographs are available with two types of diffraction grating mounting: Аutomated turret
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Single grating holder
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The devices of this series have one input port on which an entrance spectral slit is installed. There are two types of slits:
All spectral slits have standard coupling flanges providing direct attachment of various accessories of own production to the entrance slit: optical fiber adapter, condenser F#-matcher, filter wheel, fast shutters, etc.
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MS520 Series devices have an integrated shutter. It is used for measuring of the background signal or dark signal of photodetector and also for protection of the detectors from high light intensities – the shutter is automatically shut while switching the gratings, filters, zero-order wavelength setting or change of the output port. The shutter can be controlled through software or via the external device TTL-signals.
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MS520 Series devices have two output ports – axial and lateral. If you intend to select output port you should use an optional motorized Flip output mirror. Either exit spectral slits, or adapters for multi-channel detectors can be installed on each output port. MS520 monochromators-spectrographs can be provided with the following output ports:
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One axial output portThis configuration is usually applied if only one detector is used. In this case the lateral port is covered with a cap.
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One lateral output portThe lateral output port should be used for the detectors with no opportunity of being attached to the axial output port of the device due to their dimensions. For one lateral output port a fixed flip mirror is used. In configuration with one lateral output port an axial port is covered with a cap. |
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Two output portsWhen both output ports are used the automated output port selection mirror is installed in the device for the fast switching between the ports. A high precision of the output mirror positioning (better than 0.03nm for 1200 l/mm grating) allows obtaining of reproducible spectra at switching the detectors while scanning. |
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Monochromators-spectrographs of MS520 Series have two types of input and output spectral slits:
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Manually operated spectral slits
The slit width is operated manually by means of the micrometer. Slit height is regulated by a diaphragm in the range from o to 10mm. |
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Automated spectral slits
In the automated spectral slits a stepper motor is used for PC control over the blades opening width. The slit width also may be controlled manually by means of a micrometer screw. The slit height is regulated by a special diaphragm.
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All spectral slits have standard flanges that make possible attachment of various accessories of own production directly to the entrance slit: optical fiber adapter, condenser F#-matcher, filter wheel, fast shutter, detectors based on photodiodes, PMT, etc. |
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Monochromators-spectrographs of MS200 Series are completely automated spectral devices. The basic control of the devices is executed through the embedded controller. It performs continuing control of commands execution from the external control device. Besides, the embedded controller takes control over the built-in ADC which processes signals from the integral photodetectors–PMT, photodiode and etc. External control of the devices can is performed through PC.
DevCtrl softwareThe software DevCtrl is supplied with the device. DevCtrl controls over all drivers and units of the device and accessories. The software also gives an access to the system parameters and setup coefficients of the device.
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Spectroscopy software SpectraSPSpectroscopy software SpectraSP is intended for joint control over monochromators–spectrographs and detection systems based on the integral or multi-element photodetectors. SpectraSP provides simultaneous control over the device and optical radiation detection by means of various detectors with subsequent data processing and their graphical displaying. |
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input port |
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Gratings
| 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 MS520Series. Please, choose a necessary grating from the given below list, or consult our specialists. |
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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 ∙ WLBlazeand 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 |
| 75 | – | 0.11 (wavelength 200 nm, 120 order) |
0.0024 (wavelength 200 nm, 120 order) |
– | – | |
| 783600 | 3600 | hol | 0.51** | 0.011 | 185 – 450 | 500 |
| 782422 | 2400 | 225 | 0.79 | 0.017 | 185 – 450 | 750 |
| 782427 | 2400 | 270 | 0.78 | 0.017 | 185 – 540 | 750 |
| 782440 | 2400 | 400 | 0.74 | 0.016 | 270 – 750 | 750 |
| 781827 | 1800 | 270 | 1.05 | 0.023 | 185 – 540 | 1000 |
| 781840 | 1800 | 400 | 1.03 | 0.022 | 270 – 800 | 1000 |
| 781840 | 1800 | 500 | 1 | 0.022 | 335 – 1000 | 1000 |
| 781875 | 1800 | 750 | 0.86 | 0.019 | 500 – 1000 | 1000 |
| 781225 | 1200 | 250 | 1.6 | 0.035 | 185 – 500 | 1500 |
| 781228 | 1200 | 280 | 1.59 | 0.035 | 190 – 560 | 1500 |
| 781240 | 1200 | 400 | 1.58 | 0.035 | 270 – 800 | 1500 |
| 781250 | 1200 | 500 | 1.57 | 0.034 | 335 – 1000 | 1500 |
| 781260 | 1200 | 600 | 1.54 | 0.034 | 400 – 1200 | 1500 |
| 781275 | 1200 | 750 | 1.5 | 0.033 | 500 – 1500 | 1500 |
| 780623 | 600 | 230 | 3.19 | 0.07 | 185 – 460 | 3000 |
| 780630 | 600 | 300 | 3.19 | 0.07 | 200 – 600 | 3000 |
| 780640 | 600 | 400 | 3.19 | 0.07 | 270 – 800 | 3000 |
| 780650 | 600 | 500 | 3.19 | 0.07 | 335 – 1000 | 3000 |
| 780660 | 600 | 600 | 3.19 | 0.07 | 400 – 1200 | 3000 |
| 780675 | 600 | 750 | 3.17 | 0.069 | 500 – 1500 | 3000 |
| 7804008 | 400 | 800 | 4.78 | 0.1 | 535 – 1600 | 4500 |
| 7804012 | 400 | 1200 | 4.75 | 0.1 | 800 – 2400 | 4500 |
| 7804017 | 400 | 1700 | 4.66 | 0.1 | 1135 – 3400 | 4500 |
| 7804020 | 400 | 2000 | 4.57 | 0.1 | 1335 – 4000 | 4500 |
| 7804025 | 400 | 2500 | 4.38 | 0.1 | 1670 – 4500 | 4500 |
| 780330 | 300 | 300 | 6.37 | 0.14 | 200 – 600 | 6000 |
| 780335 | 300 | 350 | 6.37 | 0.14 | 235 – 700 | 6000 |
| 780350 | 300 | 500 | 6.38 | 0.14 | 335 – 1000 | 6000 |
| 780360 | 300 | 600 | 6.38 | 0.14 | 400 – 1200 | 6000 |
| 780370 | 300 | 700 | 6.39 | 0.14 | 470 – 1400 | 6000 |
| 7803010 | 300 | 1000 | 6.38 | 0.14 | 670 – 2000 | 6000 |
| 7803015 | 300 | 1500 | 6.34 | 0.14 | 1000 – 3000 | 6000 |
| 7803020 | 300 | 2000 | 6.27 | 0.14 | 1335 – 4000 | 6000 |
| 7803030 | 300 | 3000 | 5.98 | 0.13 | 2000 – 6000 | 6000 |
| 7803035 | 300 | 3500 | 5.77 | 0.13 | 2330 – 6000 | 6000 |
| 780235 | 200 | 350 | 9.55 | 0.21 | 235 – 700 | 9000 |
| 780240 | 200 | 400 | 9.55 | 0.21 | 270 – 800 | 9000 |
| 780250 | 200 | 500 | 9.56 | 0.21 | 335 – 1000 | 9000 |
| 780270 | 200 | 700 | 9.57 | 0.21 | 470 – 1400 | 9000 |
| 7802015 | 200 | 1500 | 9.57 | 0.21 | 1000 – 3000 | 9000 |
| 7802020 | 200 | 2000 | 9.54 | 0.21 | 1335 – 4000 | 9000 |
| 7802025 | 200 | 2500 | 9.48 | 0.21 | 1670 – 5000 | 9000 |
| 7802030 | 200 | 3000 | 9.4 | 0.21 | 2000 – 6000 | 9000 |
| 781547 | 150 | 475 | 12.7 | 0.28 | 320 – 950 | 12000 |
| 781570 | 150 | 700 | 12.7 | 0.28 | 470 – 1400 | 12000 |
| 7815030 | 150 | 3000 | 12.7 | 0.28 | 2000 – 6000 | 12000 |
| 7815045 | 150 | 4500 | 12.4 | 0.27 | 3000 – 9000 | 12000 |
| 780165 | 100 | 650 | 19.1 | 0.42 | 435 – 1300 | 18000 |
| 780170 | 100 | 700 | 19.1 | 0.42 | 470 – 1400 | 18000 |
| 7801010 | 100 | 1000 | 19.1 | 0.42 | 670 – 2000 | 18000 |
| 7801020 | 100 | 2000 | 19.2 | 0.42 | 1335 – 4000 | 18000 |
| 7801025 | 100 | 2500 | 19.2 | 0.42 | 1670 – 5000 | 18000 |
| 7801030 | 100 | 3000 | 19.1 | 0.42 | 2000 – 6000 | 18000 |
| 7801042 | 100 | 4200 | 19.1 | 0.42 | 2800 – 8400 | 18000 |
| 7801048 | 100 | 4800 | 19 | 0.41 | 3200 – 9600 | 18000 |
| 7801055 | 100 | 5500 | 18.9 | 0.41 | 3670 – 11000 | 18000 |
| 7801062 | 100 | 6200 | 18.8 | 0.41 | 4130 – 12400 | 18000 |
| 7801072 | 100 | 7200 | 18.5 | 0.4 | 4800 – 14400 | 18000 |
| 7801088 | 100 | 8750 | 18 | 0.39 | 5830 – 17500 | 18000 |
| 7801097 | 100 | 9700 | 17.7 | 0.39 | 6470 – 18000 | 18000 |
| 7801103 | 100 | 10300 | 17.4 | 0.38 | 6870 – 18000 | 18000 |
| 7875070 | 75 | 7000 | 25.2 | 0.55 | 4670 – 14000 | 24000 |
| 7875095 | 75 | 9500 | 24.7 | 0.54 | 6330 – 19000 | 24000 |
| 7850010 | 50 | 1000 | 38.2 | 0.83 | 670 – 2000 | 36000 |
| 7850038 | 50 | 3800 | 38.3 | 0.84 | 2530 – 7600 | 36000 |
| 7850063 | 50 | 6300 | 38.3 | 0.84 | 4200 – 12600 | 36000 |
| 7850070 | 50 | 7000 | 38.2 | 0.83 | 4670 – 14000 | 36000 |
| 7850083 | 50 | 8300 | 38.1 | 0.83 | 5530 – 16600 | 36000 |
| 7850124 | 50 | 12400 | 37.5 | 0.82 | 8270 – 24800 | 36000 |
| 7850169 | 50 | 16900 | 36.3 | 0.79 | 11270 – 33800 | 36000 |
| 7850200 | 50 | 20000 | 35.1 | 0.77 | 13330 – 36000 | 36000 |
| 7837028 | 37.5 | 2800 | 51 | 1.11 | 1870 – 5600 | 48000 |
| 7837056 | 37.5 | 5600 | 51.1 | 1.12 | 3735 – 11200 | 48000 |
| 7837093 | 37.5 | 9300 | 51 | 1.11 | 6200 – 18600 | 48000 |
| 7837156 | 37.5 | 15600 | 50.2 | 1.1 | 10400 – 31200 | 48000 |
| 7824116 | 24 | 11600 | 79.8 | 1.74 | 7730 – 23200 | 75000 |
| 7824144 | 24 | 14400 | 79.7 | 1.74 | 9600 – 28800 | 75000 |
| 7824173 | 24 | 17300 | 79.4 | 1.73 | 11530 – 34600 | 75000 |
| 7824243 | 24 | 24300 | 78.5 | 1.71 | 16200 – 48600 | 75000 |
| 7824285 | 24 | 28500 | 77.6 | 1.69 | 19000 – 57000 | 75000 |
| 7824325 | 24 | 32500 | 76.5 | 1.67 | 21670 – 65000 | 75000 |
* 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.
