MS200 Series Monochromator-Spectrograph, Perfect Imaging

MS200 Series monochromators–spectrographs are compact general-purpose instruments which can be used as monochromators or spectrographs with a large flat focal field. They are completely automated spectral devices with focal length of 200 mm and F-number of 1/3.6. Despite of compact overall sizes the parameters of short-focus monochromators–spectrographs do not concede to the parameters of long-focal spectral devices of other manufacturers.

Description

MS200 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.

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).

Model MS2001i and model MS2004i have the astigmatism-correctedoptics what makes these devices applicable in multi-channel spectroscopy.

 

A single-position holder for easy manual switching of gratings is used in both models MS2001 and MS2001i. A wide choice of changeable gratings gives the best combination of high energetic efficiency and maximal spectral resolution for different spectrum areas.

Automated four-grating turret (model MS2004 and model MS2004i) provides a fast switching of gratings with high repeatability of the set wavelength. Monochromators–spectrographs of MS200 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 MS200 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).

Compactness in combination with technical characteristics make monochromators–spectrographs of MS200 Series ideal for OEM applications in customized spectroscopy systems.

 



MS2004 2

MS benefits

 

SOL instruments: спектрометр, рамановский микроскоп, эмиссионный спектрометр. Sh MS2001 2001i

 

SOL instruments: спектрометр, рамановский микроскоп, эмиссионный спектрометр. Sh MS2004 2004i

 

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Theory & Instructions
1. Spectral Instrument. Basic Concepts and Characteristics.
2. Spectral Devices. A Spectral Device Selection. 
3. Spectra Detection. Detector Selection.

Models of monochromators–spectrographs of MS200 series

MS2001 MS2001i MS2004 MS2004i
Diffraction unit Single-position holder for manually changeable gratings Single-position holder for manually changeable gratings Four–grating turret Four–grating turret
Optics Standard Astigmatism–compensated Standard Astigmatism–compensated

 

In the devices with the standard optics (model MS2001 and model MS2004) a flat entrance deflecting mirror is used, and in the astigmatism–compensated devices (model MS2001i and model MS2004i) a cylindrical mirror is used as an entrance deflecting.

As well as in all Czerny–Turner design spectral devices, in the MS200 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.

 

Specification

Optical system

Optic layout: Cherny–Turner
(astigmatism–compensated in model MS2001i and model MS2004i)
Ports: 1 input and 2 output
Wavelength range: 185 nm – 60 µm
F/number (entrance): 3.6
Focal length (output): 200 mm
Scanning range limited by the grating rotation angle: 0 – 1300 nm (grating 1200 l/mm)
Basic mirrors: spherical
Stray light: 3 х 10-5 (20 nm from laser line 632.8 nm)
Focal plane: 26 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 MS2004i and MS2001i)

*Imaging:

Horizontal magnification: 1.18
Vertical magnification:* 1.48
Vertical spatial resolution:* < 40 µm **

* For the astigmatism-compensated models: MS2001i, MS2004i

Spectral Image Enlarged Spectral Image

Spectral image obtained with imaging monochromator-spectrograph MS2004i (grating 1200 l/mm,
light source – mercury-helium lamp, multi-channel fiber bundle, fiber core diameter 200µm, CCD pixel size 24×24 µm).

 

Drive

Motor: micro-stepper
Drive: worm
Step size: 1.6 arc seconds
Precision: ± 1 step
Max. speed: 10000 steps/s

Optics**

Reciprocal dispersion: 4.12 nm/mm
Spectral resolution
– PMT (slit width 10 µm): 0.11 nm
– Digital cameras (12 µm pixel): 0.12 nm
Repeatability: ± 0.036 nm
Wavelength accuracy: ± 0.07 nm
Average scanning step: 0.012 nm

** For grating 1200 l/mm, slit width 15µm, wavelength 546 nm

Gratings

Size: 40 x 40 x 6 mm
Rotation: about the center of grating working surface
Mounting: 1. Automated 4-grating turret
(models MS2004, MS2004i)2. Positioner for 1 manually changeable grating (models MS2001, MS2001i)
Grating repeatability for the automated 4-grating turret
(models MS2004, MS2004i)
wavelength (grating 1200 l/mm): ± 0.03 nm
vertical image: ± 40 µm
Grating repeatability for 1 manually changeable grating holder(models MS2001, MS2001i):
– wavelength (grating 1200 l\mm): ± 0.05 nm
– vertical image: ± 40 µm

Ports

Number: 1 input, 1 or 2 output
Output port repeatability
(automated mirror):
± 0.03 nm
Switching time: 5 sec

Spectral slits

Width: automated (drive) or manual (micrometer)
Parallelism: regulated from 0 up to 2.0 mm, ± 1 µm
Accuracy (slit 1 mm): ± 10 µm
Repeatability: ± 1 µm (± 1.5 µm – hand slot)
Reading accuracy (micrometer): 2 µm
Step size: 2 µm
Height: diaphragm-regulated from 0 up to 10

Integrated shutter

Shut time: ~100 ms
Max. frequency: 1 Hz
Control: On-board CPU

Control

Central: on-board CPU
External: PC
External interface: Ethernet

Overall sizes

Overal sizes (L х W х H): 300 х 200 х 160 mm
Weight: 9 kg (standard configuration)

 

Monochromator-spectograph MS200

Configuration

MS200 Series monochromators-spectrographs are compact general-purpose spectral devices, completely automated, with enough versatility to satisfy most spectroscopy applications. We propose several configurations, a wide choice of diffraction gratings, a great number of accessories and two types of the software.

 

 

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:

  • a housing
  • a diffraction gratings assembly
  • a number of diffraction gratings, their parameters
  • a number of input ports
  • a number of output ports
  • a number and type of spectral slits
  • accessories
  • software
Housing:
  • a housing with embedded controller
  • sine mechanism of grating rotation
  • input mirror
  • basic mirrors (focusing and collimator)
  • integrated shutter

Housing options:

  • with standard aluminium (Al+MgF2) coated optics
  • with standard gold coated optics
  • with imaging (astigmatism corrected) aluminium (Al+MgF2) coated optics
  • with imaging (astigmatism corrected) gold coated optics
  • with interference optics for all options of the housing, on request

 

 

 

Housing of monochromator-spectrograph MS200

Diffraction gratings assembly
 

MS200 series monochromators–spectrographs are available with two types of diffraction grating mounting:

Automated turret
(model MS2004 and model MS2004i)

Up to 4 gratings may be set in the turret. Use of the automated turret allows fast switch of gratings with the help of the control program. Turret axis is orthogonal to the grating rotation axis (wavelength scanning) and provides a high repeatability of the set wavelength while the gratings are switched.

 

 

 

 

SOL instruments: спектрометр, рамановский микроскоп, эмиссионный спектрометр. 02 avtomatizir turel

Single grating holder (model MS2001 and model MS2001i)

It allows easy manual switching of gratings. A grating is positioned in a holder with high accuracy and no additional tuning of the device is needed while the grating is changed.

 

SOL instruments: спектрометр, рамановский микроскоп, эмиссионный спектрометр. 03 derjatel na resh

Input port and entrance slit
 

The devices of this series have one input port on which an entrance spectral slit is installed.

There are two types of slits:

  • Manually operated
  • Automated

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.

 

 

Input port of mocnochromator-spectrograph MS200

 

Integrated shutter
 

MS200 Series devices have 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.

 

Output ports
 

MS200 Series monochromators-spectrographs 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.

Note

Due to the small dimensions of the device only detectors with width up to 70 mm may be attached to the axial output port. Detectors intended to be attached to the lateral port have no size limitations.
MS200 monochromators-spectrographs can be provided with the following output ports:

  • One axial output port
  • One lateral output port
  • Two output ports
 

Two output ports

 

One axial output port

This configuration is usually applied if only one detector is used.

In this case the lateral port is covered with a cap.

Note

Due to the small size of the device only detectors with the width up to 70 mm may be attached to the axial output port.

One axial output port

 

One lateral output port

The 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 turning mirror is used.

In configuration with one lateral output port an axial port is covered with a cap.

One lateral output port

 

Two output ports

When 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.

Note

Due to the small dimensions of the device only detectors with the width up to 70 mm may be attached to the axial output port.

 

Two output ports, flip mirror

 

Spectral slits
 

Monochromators-spectrographs of MS200 Series have two types of input and output spectral slits:

  • Manually operated
  • Automated (combined)

Manually operated spectral slits

width regulated from 0 up to 2.0 mm
parallelism ± 1 µm
accuracy (slit width 1 mm) ± 10 µm
repeatability ± 1.5 µm
reading accuracy (micrometer) 2 µm
height 10 mm

 

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.

 

 

SOL instruments: спектрометр, рамановский микроскоп, эмиссионный спектрометр. 09 manual slit

Automated spectral slits

width regulated from 0 up to 2.0 mm
parallelism ± 1 µm
accuracy (slit width 1 mm) ± 10 µm
repeatability ± 1 µm
reading accuracy (micrometer) 2 µm
step size 0.5 µm
height 10 mm

 

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.

 

 

SOL instruments: спектрометр, рамановский микроскоп, эмиссионный спектрометр. 10 motor slit

 

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.

SOL instruments: спектрометр, рамановский микроскоп, эмиссионный спектрометр. 11 avtomatizir schel svetovod eng

 

Control of the devices
 

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 software

The 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.

 

Spectroscopy software SpectraSP

Spectroscopy 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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SOL instruments: спектрометр, рамановский микроскоп, эмиссионный спектрометр. spectra sp ms520

Configuration diagrams of the devices
 

Accessories for input port

Input port

 

Accessories for output ports

Output port

 

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 MS200Series. 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 ∙ 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
443600 3600 hol 1.35** 0.04 185 – 430 430
442422 2400 225 2.08 0.06 185 – 450 650
442427 2400 270 2.06 0.06 185 – 540 650
442770 2400 400 1.97 0.06 265 – 650 650
441827 1800 270 2.78 0.08 185 – 540 870
441840 1800 400 2.73 0.08 265 – 800 870
441850 1800 500 2.66 0.08 330 – 870 870
441875 1800 750 2.31 0.08 500 – 870 870
441225 1200 250 4.19 0.12 185 – 500 1300
441228 1200 280 4.19 0.12 185 – 560 1300
441240 1200 400 4.17 0.12 265 – 800 1300
441250 1200 500 4.14 0.12 330 – 1000 1300
441260 1200 600 4.09 0.12 400 – 1200 1300
441275 1200 750 3.98 0.12 500 – 1300 1300
440623 600 230 8.34 0.25 185 – 460 2600
440630 600 300 8.35 0.25 200 – 600 2600
440640 600 400 8.37 0.25 265 – 800 2600
440650 600 500 8.37 0.25 330 – 1000 2600
440660 600 600 8.37 0.25 400 – 1200 2600
440675 600 750 8.35 0.25 500 – 1500 2600
440428 400 280 12.49 0.36 185 – 560 3900
4404008 400 800  12.56 0.36 570 – 1520 3900
4404012 400 1200 12.51 0.36 800 – 2400 3900
4404017 400 1700 12.33 0.36 1200 – 3200 3900
4404020 400 2000 12.15 0.36 1400 – 3800 3900
4404025 400 2500 11.71 0.36 1800 – 4750 3900
440330 300 300 16.64 0.48 200 – 600 5200
440335 300 350 16.65 0.48 230 – 700 5200
440350 300 500 16.69 0.48 330 – 1000 5200
440360 300 600 16.71 0.48 400 – 1200 5200
440370 300 700 16.72 0.48 465 – 1400 5200
4403010 300 1000 16.75 0.48 700 – 1900 5200
4403015 300 1500 16.71 0.48 1000 – 2850 5200
4403020 300 2000 16.56 0.48 1400 – 3800 5200
4403030 300 3000 15.93 0.48 2100 – 5200 5200
4403035 300 3500 15.42 0.48 2500 – 5200 5200
440235 200 350 24.93 0.74 230 – 700 7800
440240 200 400 24.94 0.74 265 – 800 7800
440250 200 500 24.97 0.74 330 – 1000 7800
440270 200 700 25.02 0.74 465 – 1400 7800
4402015 200 1500 25.12 0.74 1000 – 2850 7800
4402020 200 2000 25.09 0.74 1400 – 3800 7800
4402025 200 2500 25.00 0.74 1800 – 4750 7800
4402030 200 3000 24.84 0.74 2100 – 5700 7800
441547 150 475 33.24 0.98 320 – 950 10400
441570 150 700 33.30 0.98 465 – 1400 10400
4415030 150 3000 33.41 0.98 2100 – 5700 10400
4415045 150 4500 32.90 0.98 3200 – 8550 10400
440165 100 650 49.83 1.45 430 – 1300 15600
440170 100 700 49.85 1.45 465 – 1400 15600
4401010 100 1000 49.94 1.45 700 – 1900 15600
4401020 100 2000 50.15 1.45 1400 – 3800 15600
4401025 100 2500 51.21 1.45 1800 – 4750 15600
4401030 100 3000 50.24 1.45 2100 – 5700 15600
4401042 100 4160 50.17 1.45 3000 – 7900 15600
4401048 100 4840 50.05 1.45 3500 – 9200 15600
4401055 100 5500 49.86 1.45 3900 – 10500 15600
4401062 100 6200 49.60 1.45 4400 – 11800 15600
4401072 100 7200 49.10 1.45 5100 – 13700 15600
4401088 100 8750 48.01 1.45 6200 – 15600 15600
4401097 100 9700 47.13 1.45 6900 – 15600 15600
4401103 100 10300 46.49 1.45 7300 – 15600 15600
4475070 75 7000 66.59 1.95 5000 – 13000 20700
4475095 75 9500 65.52 1.95 6800 – 18000 20700
4450010 50 1000 99.57 2.9 700 – 1900 31000
4450038 50 3800 100.27 2.9 2700 – 7200 31000
4450063 50 6300 100.48 2.9 4500 – 12000 31000
4450070 50 7000 100.46 2.9 5000 – 13300 31000
4450083 50 8300 100.34 2.9 5900 – 15800 31000
4450124 50 12360 99.22 2.9 8800 – 23500 31000
4450169 50 16900 96.50 2.9 12000 – 31000 31000
4450200 50 20000 93.63 2.9 14300 – 31000 31000
4437028 37.5 2790 133.2 3.9 2000 – 5300 42000
4437056 37.5 5570 133.8 3.9 4000 – 10600 42000
4437093 37.5 9260 134.0 3.9 6600 – 17600 42000
4437156 37.5 15600 132.6 3.9 11100 – 29700 42000
4424116 24 11600 209.3 6.3 8300 – 22000 65000
4424144 24 14400 209.3 6.3 10300 – 27400 65000
4424173 24 17300 209.0 6.3 12400 – 32900 65000
4424243 24 24300 207.3 6.3 17400 – 46200 65000
4424285 24 28500 205.4 6.3 20400 – 54200 65000
4424325 24 32500 203.0 6.3 23200 – 61800 65000

 

* at the blaze wavelength

** at the wavelength 225 nm