High-Resolution Automated Raman Spectrograph Model M833

  • Description
  • Specifications
  • OPTIONS AND ACCESSORIES
  • OPTICAL BENCH FEATURES

M833 is a unique high-aperture double dispersive monochromator-spectrograph whose compact design combines high spectral resolution intrinsic for long-focus instruments and extremely low stray light which is an essential requirement for Raman spectroscopy, as well as for any other low-light-level applications.

Features

  • Extremely low stray light allows the multi-element detector to simultaneously acquire both Stokes and Anti-Stokes components at the distance up to 20 cm-1 from the excitation line (1200 l/mm gratings) without using any Notch or Edge-filters.
  • The compact long-focus instrument (f=833mm) with the unique high aperture (F# 1:5.5) enables solving tasks, which demand high spectral resolution, yet occupies little space in your laboratory and, furthermore, is mobile.
  • The M833i in the Imaging mode provides absolute astigmatism compensation and high spatial resolution along the exit slit, meanwhile preserving the ideal line quality.
  • Three pairs of gratings (number of lines per mm and blaze wavelength are tailored to the Customer's requirements) are supplied in a standard set and ensure the widest range of applications.
  • Two input and two output ports can be completed with the full set of accessories manufactured by SOLAR LS: standard and crossed entrance slits, order separating filter wheels, aperture matching units and optical fibers, CCD detectors and adapters for them.
  • Full computer control: slits, diffraction grating turrets and filter wheels, input/output port switching is controlled by the intelligent and easy-to-use software.
  • The InstrumentManipulator software arranges automated control over entrance and exit slits, changing of order separating filters, switching of input/output ports, diffraction gratings scanning and change. The SSPLine software provides detector control and allows to sew spectra obtained by several diffraction grating scans in order to get a panoramic spectrum. A lot of possibilities of mathematical spectra processing and analysis (intensity calibration, automatic search and analysis of peaks, spectra calculator, axonometric spectrum, etc.) are also provided.
  • At your request, DLL and/or VI program modules are supplied for controlling the instrument via the customised software or LabVIEW.

Applications:

  • Raman Spectroscopy
  • Emission and Fluorescence Spectroscopy
  • Analytical Tasks Demanding High Resolution in the Range from UV to IR
  • Multi-Channel Spectroscopy

Instrument Configuration

The M833 comprises either one or two input and output ports. Input port may hold either a standard entrance slit, or a crossed entrance slit (optionally). All the spectral slits are automated; their width is adjusted by the instrument software. The slit design also contains a microscrew, which provides the possibility to manually adjust the opening width of the slit knives.

The standard M833 version comprises three pairs of diffraction gratings mounted on two turrets. Since the M833 implements separate control for scanning and grating changing, each diffraction grating, when scanning the spectrum, rotates around an axis passing through its center. This allows to bring your real optical system close to the initial optical design and to provide its highest optical quality.

The standard optics comprises spherical and flat mirrors with Al+MgF2 coating optimized for high UV efficiency. Optionally the M833 may contain optics with Al+SiO2 or gold coating for high efficiency in the infrared spectral range.

The M833 output ports may hold either two exit slits, or one exit slit and detector, or two detectors concurrently.

Direct (axial) and lateral (radial) output ports operate alternately. Switching between the output ports is effected by the software with the use of the swinging mirror, which in its operating position directs light to the lateral (radial) output port. The instrument is also available with one output (axial) port. If the radial output port is not used, it is plugged.

The M833 exit slit has 4 mounting holes M2.5 that allow you fixing your own detector to the slit housing, if necessary. Location of mounting holes is shown in the figure below.

Note: To avoid a breakdown of the slit mechanism it is prohibited to fix any units weighing more than 1 kg to the slit housing!

Option Value
Optical scheme optimized Czerny-Turner with double dispersion
Spectral range - typical 180 – 4800nm (refer to the specifications below),
- up to 40µm when the appropriate gratings are used
F/Number 1 : 5.5
Effective focal length, mm 833
Ports two inputs and two outputs
Flat field, mm 30 x 10
Imaging Option. Available for the lateral output port
Diffraction gratings 70 x 70 x 10mm, automated turret with three pairs of gratings from the list below1)
- lines/mm1) 2400 1800 1200 900 600 300
- blaze wavelength, nm 225 400 600 600 1000 2000
- spectral range, nm 190 - 600 253 - 800 380 -1200 506 - 1600 760 - 2400 1500 - 4800
- scanning range, nm 0 - 640 180 - 850 0 - 1280 0 - 1710 0 - 2560 0 - 5120
- reciprocal linear dispersion average, nm/mm 0.39 0.52 0.78 1.04 1.56 3.12
- multichannel array bandpass, average, nm 11.282) 16.922) 22.572) 33.842) 203) 403)
- spectral resolution, average, nm 0.0122) 0.0243) 0.0162) 0.0333) 0.0242) 0.0483) 0.0322) 0.0663) 0.14) 0.24)
- spectral resolution, average, cm-1 0.82) 1.563) 0.572) 1.173) 0.42) 0.783) 0.32) 0.63) 0.434) 0.24)
Wavelength accuracy, nm ±0.03 0.04 0.06 0.08 0.12 0.24
Wavelength reproducibility, nm 0.006 0.008 0.012 0.016 0.024 0.048
Step of grating rotation, nm 0.0017 0.0023 0.0035 0.0046 0.007 0.014
Scanning speed, nm/s 5,3 7 10.5 14 23 42
Entrance/exit slits Automatic and manual adjustment
Slit width, mm 0 - 2
Slit height, mm 12
Parallelism, m +/- 1
Micrometer reading accuracy, m +/- 1
Step size, m 0.5
Precision, m +/- 10
Filter wheel Automatic switching
Max number of filters 8
Standard number of filters 5
Filter size, mm 20
Light aperture, mm 18
Integrated shutter Computer controlled, serves for measuring dark signal
Computer interface Full-Speed USB

1) upon your request diffraction gratings with another number of lines and another blaze can be used.

2) for detector with 8 um pixel size and 29.1 mm active area (resolution is 4 pixels)

3) for detector with 25 um pixel size and 25.6 mm active area (resolution is 2.5 pixels)

4) for detector with 25 um pixel size and 12.8 mm active area (resolution is 2.5 pixels)

Optical parameters calculator

Here you can calculate the estimated values of reciprocal linear dispersion, multichannel array bandpass and spectral resolution depending on the selected diffraction grating, wavelength and detector properties.

Choose the diffraction grating

Grating operating range, nm

Pick up central wavelength, nm

Reciprocal linear dispersion nm/mm

The M833 monochromator-spectrograph has a wide range of options and accessories, which allows efficient collection of light from the sample located at a finite distance and in infinity, delivering emission to the monochromator with and without an optical fiber, performing effective aperture matching of the optical fiber and monochromator.

All the exit slits are equipped with precision focusing devices; and detector adapters allow easy detector focusing. The detector adapter of the long-focus M833 monochromator-spectrograph allows changing the slope of detector plane relative to the optical bench.

Cassegrain lenses allow collecting light from objects located at a distance of 3.5m to infinity.

Adapters PS-2 and PS-3 provide for the collection of light from a closely located sample and its effective input into an optical fiber. PS-2 features high transmittance in the UV range, while PS-3 has the possibility of installing an edge filter

  • Order Separating Filters Wheels
  • Aperture Matching Adapters
  • Condensers for collecting light into the fiber
  • Condensers for collecting light into the monochromator
  • Crossed Entrance Slit (optionally installed instead of the Standard Entrance Slit)
  • Optical Fibers
  • Adapters for attaching CCD detectors
  • CCD detectors
  • Cassegrain lenses

Consult a SOLAR LS specialist to select the complete set of the device that best meets the requirement of your instrument complex.

Multi-channel CCD detectors

Multichannel CCD detectors by ANDOR Technology TM The unique vacuum technology UltravacTM; deep thermoelectric cooling (down to -100°C)
iVac Series, Spectroscopic CCDDR 324B-FI model, front-illuminated CCD sensor, UltraVacTM thermo-electric cooling down to -60C, spectral range 400-1000nm, 1650õ200pixels, pixel size 16x16µm, image area 26.4mm x 3.2mm, 16 bits digitisation
iDus Series, Spectroscopic CCDDV 401A-BV model, back-illuminated CCD sensor, UltraVacTM thermo-electric cooling down to -70C, spectral range 200-1100nm, 1024x127pixels, pixel size 26x26m, image area 26.6mm x 3.6mm, 16 bits digitisation
DU 401A-BV model, back-illuminated CCD sensor, UltraVacTM thermo-electric cooling down to -100C, spectral range 200-1100nm, 1024x127pixels, pixel size 26x26m, image area 26.6mm x 3.6mm, 16 bits digitisation.
Newton Series, EMCCDDU970P-FI model (*), front-illuminated EMCCD sensor, UltraVacTM thermo-electric cooling down to -100C, spectral range 400-1000nm, 1600x200pixels, pixel size 16x16m, dual output amplifier, crop mode, Variable readout speed up to 3MHz, 16 bits digitisation.
DU970P-BV model (*), back-illuminated EMCCD sensor, UltraVacTM thermo-electric cooling down to -100C, spectral range 200-1000nm, 1600x200pixels, pixel size 16x16m, dual output amplifier, crop mode, Variable readout speed up to 3MHz, 16 bits digitisation
iStar Series, Gated iCCDDH320T-25U-03 model (*), Ultra Fast Gated Intensified CCD Camera, spectral range 200-900nm, 124x256 CCD 100% Fill Factor, 25mm tube, Gen2 Multialkali S20 Photocathode, P43 phosphor Multi-Mhz Readout Speeds, Integrated Digital Delay Generator, 3 ns Crop Mode sensor, Photocathode dry gas purge port, USB data interface.

(*) other models are supplied upon request

Two-dimensional HAMAMATSU arrays for the 200-1100nm range
UC-16H7306, Spectroscopic CCDS7030-1006 sensor, non-cooled, spectral range 200-1100nm, 1024x64 pixels, pixel size 24x24m, image area 24.6x1.4mm, 16 bit digitisation
UC-16H7307, Spectroscopic CCDS7030-1007 sensor, non-cooled, spectral range 200-1100nm, 1024x128 pixels, pixel size 24x24m, image area 24.6x2.9mm, 16 bit digitisation
UC-16H7316, Spectroscopic CCDS7031-1006 back-illuminated sensor, ÒÅ cooling –10C, spectral range 200-1100nm, 1024x64 pixels, pixel size 24x24m, image area 24.6x1.4mm, 16 bit digitisation
UC-16H7317, Spectroscopic CCDS7031-1007 back-illuminated sensor, ÒÅ cooling 10C, spectral range 200-1100nm, 1024x128 pixels, pixel size 24x24m, image area 24.6x2.9mm, 16 bit digitisation
UC-16H7318, Spectroscopic CCDS7031-1008 back-illuminated sensor, ÒÅ cooling 10C, spectral range 200-1100nm, 1024x256 pixels, pixel size 24x24m, image area 24.6 x 6.1mm, 16 bit digitisation
Linear InGaAs HAMAMATSU sensors for NIR-range 900-1700nm (up to 2600nm)
UC-16H904, InGaAs sensorG9204-512D image sensor, spectral range 0.9-1.7m, non-cooled, 512 pixels, pixel size 25x500m, image area 12.8x0.5mm, 16 bit digitisation
UC-16H912, InGaAs sensorG9212-512S image sensor, InGaAs, spectral range 0.9-1.7m, ÒÅ cooling 10C, 512 pixels, pixel size 25x250m, image area 12.8x0.25mm, 16 bit digitisation
UC-16H914, InGaAs sensorG9214-512S image sensor, InGaAs, spectral range 0.9-1.7m, ÒÅ cooling 10C, 512 pixels, pixel size 25x500m, image area 12.8x0.5mm, 16 bit digitisation
UC-16H908, InGaAs sensorG9208-256W image sensor, InGaAs, spectral range 0.9-2.6m, ÒÅ cooling 20C, 256 pixels, pixel size 50x250m, image area 12.8x0.25mm, 16 bit digitisation
Linear non-cooled sensors for the 200-1100nm range
UC-12T3TCD1304 image sensor, spectral range 190-1100nm, non-cooled, 3648 pixels, pixel width 8m, image area 29.18x0.2mm, 14 bit digitisation
UC-12T2TCD1205 image sensor, spectral range 200-1100nm, non-cooled, 2048 pixels, pixel width 14m, image area 28.672x0.2mm,14 bit digitisation
UC-14H83S8378-1024Q image sensor, spectral range 200-1100nm, non-cooled, 1024 pixels, pixel width 25m, image area 25.6x0.2mm,14 bit digitisation
U2C-16H11156S11156-2048-01 image sensor, spectral range 200-1100nm, non-cooled, 2048 pixels, pixel width 14m, element size 28.672x1.0mm, 16 bit digitisation, integrated electric shutter, reading rate 5MHz, min. storage time 31s

Multi-channel CCD detectors

Multichannel CCD detectors by ANDOR Technology TMThe unique vacuum technology UltravacTM; deep thermoelectric cooling (down to -100C)
iVacSeries, Spectroscopic CCDDR 324B-FI model, front-illuminated CCD sensor, UltraVacTM thermo-electric cooling down to -60C, spectral range 400-1000nm, 1650*200pixels, pixel size 16*16m, image area 26.4mm * 3.2mm, 16 bits digitisation
iDusSeries, Spectroscopic CCDDV 401A-BV model, back-illuminated CCD sensor, UltraVacTM thermo-electric cooling down to -70C, spectral range 200-1100nm, 1024*127pixels, pixel size 26*26m, image area 26.6mm * 3.6mm, 16 bits digitisation
DU 401A-BV model, back-illuminated CCD sensor, UltraVacTM thermo-electric cooling down to -100C, spectral range 200-1100nm, 1024*127pixels, pixel size 26*26m, image area 26.6mm * 3.6mm, 16 bits digitisation.
NewtonSeries, EMCCDDU970P-FI model (*), front-illuminated EMCCD sensor, UltraVacTM thermo-electric cooling down to -100C, spectral range 400-1000nm, 1600*200pixels, pixel size 16*16m, dual output amplifier, crop mode, Variable readout speed up to 3MHz, 16 bits digitisation.
DU970P-BV model (*), back-illuminated EMCCD sensor, UltraVacTM thermo-electric cooling down to -100C, spectral range 200-1000nm, 1600*200pixels, pixel size 16*16m, dual output amplifier, crop mode, Variable readout speed up to 3MHz, 16 bits digitisation
iStarSeries, Gated iCCDDH320T-25U-03 model (*), Ultra Fast Gated Intensified CCD Camera, spectral range 200-900nm, 124*256 CCD 100% Fill Factor, 25mm tube, Gen2 Multialkali S20 Photocathode, P43 phosphor Multi-Mhz Readout Speeds, Integrated Digital Delay Generator, 3 ns Crop Mode sensor, Photocathode dry gas purge port, USB data interface.

(*) other models are supplied upon request

Two-dimensional HAMAMATSU arrays for the 200-1100nm range
UC-16H7306, Spectroscopic CCDS7030-1006 sensor, non-cooled, spectral range 200-1100nm, 1024x64 pixels, pixel size 24x24m, image area 24.6x1.4mm, 16 bit digitisation
UC-16H7307, Spectroscopic CCDS7030-1007 sensor, non-cooled, spectral range 200-1100nm, 1024x128 pixels, pixel size 24x24m, image area 24.6x2.9mm, 16 bit digitisation
UC-16H7316, Spectroscopic CCDS7031-1006 back-illuminated sensor, ÒÅ cooling 10C, spectral range 200-1100nm, 1024x64 pixels, pixel size 24x24m, image area 24.6x1.4mm, 16 bit digitisation
UC-16H7317, Spectroscopic CCDS7031-1007 back-illuminated sensor, ÒÅ cooling 10C, spectral range 200-1100nm, 1024x128 pixels, pixel size 24x24m, image area 24.6x2.9mm, 16 bit digitisation
UC-16H7318, Spectroscopic CCDS7031-1008 back-illuminated sensor, ÒÅ cooling 10C, spectral range 200-1100nm, 1024x256 pixels, pixel size 24x24m, image area 24.6 x 6.1mm, 16 bit digitisation
Linear InGaAs HAMAMATSU sensors for NIR-range 900-1700nm (up to 2600nm)
UC-16H904, InGaAs sensorG9204-512D image sensor, spectral range 0.9-1.7m, non-cooled, 512 pixels, pixel size 25x500m, image area 12.8x0.5mm, 16 bit digitisation
UC-16H912, InGaAs sensorG9212-512S image sensor, InGaAs, spectral range 0.9-1.7m, ÒÅ cooling 10C, 512 pixels, pixel size 25x250m, image area 12.8x0.25mm, 16 bit digitisation
UC-16H914, InGaAs sensorG9214-512S image sensor, InGaAs, spectral range 0.9-1.7m, ÒÅ cooling 10C, 512 pixels, pixel size 25x500m, image area 12.8x0.5mm, 16 bit digitisation
UC-16H908, InGaAs sensorG9208-256W image sensor, InGaAs, spectral range 0.9-2.6m, ÒÅ cooling 20C, 256 pixels, pixel size 50x250m, image area 12.8x0.25mm, 16 bit digitisation
Linear non-cooled sensors for the 200-1100nm range
UC-12T3TCD1304 image sensor, spectral range 190-1100nm, non-cooled, 3648 pixels, pixel width 8m, image area 29.18x0.2mm, 14 bit digitisation
UC-12T2TCD1205 image sensor, spectral range 200-1100nm, non-cooled, 2048 pixels, pixel width 14m, image area 28.672x0.2mm,14 bit digitisation
UC-14H83S8378-1024Q image sensor, spectral range 200-1100nm, non-cooled, 1024 pixels, pixel width 25m, image area 25.6x0.2mm,14 bit digitisation
U2C-16H11156S11156-2048-01 image sensor, spectral range 200-1100nm, non-cooled, 2048 pixels, pixel width 14m, element size 28.672x1.0mm, 16 bit digitisation, integrated electric shutter, reading rate 5MHz, min. storage time 31s

The M833 is a unique double dispersive monochromator-spectrograph consisting of two Czerny-Turner monochromators. Its key difference from any conventional double monochromator is that the M833 features the 30mmx10mm flat field and allows attaching not only a single detector (PMT), but also a multichannel array for simultaneous detection of a wide spectrum range.

High-Resolution Automated Raman Spectrograph Model M833

This feature is implemented by replacing the camera mirror of the first monochromator and the collimator mirror of the second monochromator with a specially designed optical matching system.

In addition, the optical matching system performs the following functions:

  • Provides an optical coupling between the two monochromators-spectrographs located one above the other in a two-level optical design. Thus, we achieve compactness and mobility of the long-focus monochromator-spectrograph M833.
  • Ensures the complete coma compensation for any wavelength in the center of the exit slit (or in the center of a multichannel array). As a result the M833 does not have the spectral region of primary coma compensation. The M833 demonstrates its unique spectral resolution and high spectral line quality for any wavelength within the spectral range of gratings diffraction efficiency.

The M833 optical layout and design completely exclude the possibility of re-reflections in specified spectral regions of the device operation, and reduce stray light by two orders of magnitude as compared to single monochromators having similar dispersion/focal length.

Astigmatism compensation (IMAGING option)

Astigmatism compensation (IMAGING option) is a frequently used and popular M833 option. In case of the fiber input the IMAGING allows to effectively collect Raman signal to a height-limited detector.

The M833 astigmatism compensator is a cylindrical mirror installed at the output of the M833 optical bench instead of a flat swinging mirror directing light to the lateral (radial) port. Thus, astigmatism is usually compensated at the lateral output port of the M833, while the axial port configuration remains standard.

In general, astigmatism is common to all spectral instruments; this is a phenomenon when the point on the entrance slit is displayed as a vertical segment in the image plane. The M833 astigmatic segment is 7.7mm in the center of the flat field, and respectively 7.4mm and 8.2mm at the edges of the field. Astigmatism does not usually impair the instrument resolution, but, depending on the height of the detector used, can affect the overall sensitivity of the system.

Astigmatism correction is imperative in the multichannel spectroscopy, in case you need to adequately convey the illumination distribution along the slit, as well as when using spectrographs with multichannel arrays in the 2D-image mode (Imaging).

Introducing the astigmatism compensator in the optical scheme allows correcting astigmatism in the exit slit plane to the value of about 50mm. This fact must be considered when calculating the expected optical resolution of the M833 with a specific diffraction grating. Astigmatism compensation also affects the vertical magnification of the M833:

M833 magnification Horizontal magnification Vertical magnification
without astigmatism compensation
(Standard mode)
1,08 1,08
with astigmatism compensation
(Imaging mode)
1,08 0,8

Spectra acquired with the M833

Wide instrument capabilities are demonstrated below by Raman spectra acquired with the M833i (the 1200 l/mm gratings).

The single-mode laser (532nm, 10mW) was used as an excitation source. Registration was performed by the S7031-1006 Hamamatsu CCD (24mm x 24mm pixel size, 24.6mm x 1.4mm image area, 16bit digitisation, Thermo-electric cooling 10C, the binning mode). The instrumental set-up is shown in Fig.3.

Fig. 1. Raman spectrum of paratellurite TeO2 crystal. The M833 is a unique spectrograph allowing to simultaneously observe both Stokes and Anti-Stokes components with the multichannel CCD detector as close to the excitation line as 20cm-1

Fig. 2. Raman spectra of a single nitron fiber demonstrate characteristic peaks in the range of 300...480cm-1 with the maximum at 405cm-1

Fig. 3. Instrumental set-up of Raman spectra acquiring. Raman spectra were collected at 90 to the excitation beam using the PS-3 wide-aperture condenser, 600m optical fiber and the AFA aperture matching adapter.