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

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

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

SOL instruments: спектрометр, рамановский микроскоп, эмиссионный спектрометр. book-2

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 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)

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

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.

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

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 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.

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.

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.

SOL instruments: спектрометр, рамановский микроскоп, эмиссионный спектрометр. 31

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

Configuration diagrams of the devices

Input port

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:
WL_Blaze = 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 ∙ WL_Blazeand 2 ∙ WL_Blaze.
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

MS200 Series Monochromator-Spectrograph, Perfect Imaging

Description