MS350 Series Monochromator-Spectrograph, Perfect Imaging

MS350 Series monochromators–spectrographs a 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 350 mm and F-number of 1/3.8.

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).

M350 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 MS3501i and model MS3504i have the astigmatism-corrected optics what makes these devices applicable in multi-channel spectroscopy.

Automated four-grating turret (model MS3504 and model MS3504i) provides a fast switching of gratings with high repeatability of the set wavelength and the vertical image.

Description

MS350 Series monochromators–spectrographs a 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 350 mm and F-number of 1/3.8.

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).

M350 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 MS3501i and model MS3504i have the astigmatism-correctedoptics what makes these devices applicable in multi-channel spectroscopy.

Automated four-grating turret (model MS3504 and model MS3504i) provides a fast switching of gratings with high repeatability of the set wavelength and the vertical image.

In MS3501 and MS3501i models a single-position holder is used for easy manual switching of gratings. A wide choice of changeable gratings gives the best combination of high energetic efficiency and maximal spectral resolution for different spectrum areas.

Monochromators–spectrographs of MS350 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).

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.

Due to the perfect technical characteristics, flexible configuration and wide choice of accessories, Monochromators–spectrographs of MS350 series are the most multi-purpose and popular instruments among all the range of our spectral products.

I M A G I N G

MS3504i 2018

MS benefits

 

SOL instruments: спектрометр, рамановский микроскоп, эмиссионный спектрометр. ms3504 optic shem

 

SOL instruments: спектрометр, рамановский микроскоп, эмиссионный спектрометр. ms3501 opic shem

 

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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 MS350 series

Model: MS3501 MS3501i MS3504 MS3504i
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 (Imaging) Standard Astigmatism–compensated (Imaging)

 

In the devices with the standard optics (model MS3501 and model MS3504) a flat entrance deflecting mirror is used, and in the astigmatism–compensated devices (model MS3501i and model MS3504i) a cylindrical mirror is used as an entrance deflecting.

As well as in all Czerny–Turner design spectral devices, in the MS350 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 MS3504 and MS3504i 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 sheme: Cherny–Turner
(astigmatism–compensated in model MS3501i and model MS3504i)
Ports: 1 input, 2 output
Wavelength range: 185 nm – 60 µm (depends on the type of grating)
F/number (entrance): 3.8
Focal length (output): 350 mm
Scanning range limited by the grating rotation angle: 0 – 1280 nm (grating 1200 l/mm)
Main mirrors: spherical
Stray light: 1 х 10-5 (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 MS3504i and MS3501i)

*Imaging

Horizontal magnification: 1.09
*Vertical magnification: 1.49
*Vertical spatial resolution: < 35 µm

* For the astigmatism-compensated models: MS3501i, MS3504i

Spectral Image Enlarged Spectral Image

Spectral image obtained with imaging monochromator-spectrograph MS3504i (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: stepper, with fractional steps
Drive: Warm
Step size: 1.62 arc seconds
Precision: ± 1 step
Max. speed: 10000 steps/s

 **Optics

Reciprocal dispersion: 2.37 nm/mm
Spectral resolution:
– PMT (slit width 10 µm): 0.06 nm
– Digital cameras (12 µm pixel): 0.07 nm
Repeatability: ± 0.03 nm
Wavelength accuracy: ± 0.06 nm
Average scanning step: 0.01 nm

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

Gratings

Size: 70 x 70 x 10 mm
Rotation: About the center of grating working surface
Mounting: 1. Automated 4-grating turret
(models MS3504, MS3504i)

2. Positioner for 1 manually changeable grating (модели MS3501 и MS3501i)

Grating repeatability for the automated 4-grating turret
(models MS3504, MS3504i)
– wavelength: ± 0.03 nm
– vertical image: ± 50 µm
Holder for 1 manually changeable grating (models MS3501 and MS3501i)
– wavelength: ± 0.05 nm
– vertical image: ± 75 µm

Ports

Number: 1 input, 2 output
Output port repeatability (automated mirror): ± 0.03 nm
Switching time (output port): 4 s

Spectral slits

Control: Automated (drive) or manual (micrometer)
Width: Regulated from 0 up to 2.0 mm
Parallelism: ± 1 µm
Accuracy (slit 1 mm): ± 10 µm
Repeatability: ± 1 µm (± 1.5 µm – manual slit)
Reading accuracy (micrometer): 2 µm
Step size (automated slit): 0.5 µm
Height: Diaphragm-regulated from 0 up to 10 mm

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): 510 х395 х 200 mm
Weight: 19 kg (may differ, depends on configuration)

Monochromator-spectograph MS350

 

 

Configuration

MS350 Series monochromators-spectrographs are general-purpose spectral devices with enough versatility to satisfy most spectroscopyapplications. 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
  • worm 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 MS350

Diffraction grating assembly:
 

MS350 series monochromators–spectrographs are available with two types of diffraction grating mounting:

Аutomated turret
(model MS3504 and model MS3504i)

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.

 

 

 

 

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Single grating holder
(model MS3501 and MS3501i)

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.

 

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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 MS350

 

Integrated shutter
 

MS350 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.

 

Output ports
 

MS350 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.

MS350 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.

 

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 flip 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.

 

Two output ports, flip mirror

 

Spectral slits
 

Monochromators-spectrographs of MS350 Series have two types of input and output spectral slits:

  • Manually operated
  • Automated

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

Автоматизированные спектральные щели

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 diaphragm in the range from 0 up to 10 mm.

 

 

 

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.

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Control of the devices
 

Monochromators-spectrographs of MS350 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 ports

 

Accessories for output ports


Output ports

 

Grating

 

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 MS350.
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
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

 

* at the blaze wavelength

** at the wavelength 225 nm