Automated Monochromator-Spectrograph Model M266

  • Description
  • Specifications
  • Options
  • OPTICAL BENCH FEATURES

The M266 is our general-purpose high-aperture instrument with high line quality and low stray light performance, featuring 284mm focus and 30x10mm flat field.

Features:

  • High aperture ratio (F=1:3.8), low stray light and perfect line quality enable successful use of the M266 in a wide range of applications.
  • Two output ports allow connecting to the M266 either two exit slits, exit slit/detector or two detectors concurrently.
  • The M266i version (Imaging) features an astigmatism compensator for both output ports, thus promoting the use of the M266 with matrix detectors in the multi-channel spectroscopy, not only in the binning mode, but also in the 2D-image mode.
  • M266 is completely automated. Spectrum scanning along wavelengths, change of gratings and order separating filters, adjustment of slit width and selection of an output port are performed automatically, guided by the intelligent and easy-to-use software.
  • An automatic shutter provides for automatic background (dark current) subtraction, along with detector protection against excessive illumination from the light source.
  • The Instrument Manipulator 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 LabView drivers are supplied with the M266 for controlling the instrument via the customised software or LabView.

Applications:

  • Emission, Fluorescence and Raman Spectroscopy
  • Multi-Channel Spectroscopy
  • Absorption, Reflection and Transmission
  • Measurements
  • Analytical Tasks from UV to IR

Instrument Configuration

The M266 comprises one input port and two output ports. The 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 knives.

Depending on modification, the M266 may contain either a turret with four diffraction gratings, or one grating in the holder.

ModificationComponents
M266-IVThe standard optics and the turret with 4 diffraction gratings
M266i-IVThe Imaging optics (astigmatism compensator) and the turret with 4 diffraction gratings
M266-IThe standard optics and one diffraction grating
M266i-IThe Imaging optics (astigmatism compensator) and one diffraction grating

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

The M266 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 M266 exit slit has 4 mounting holes M2.5 that allow you fixing your own detector to the slit housing, if necessary. Location of the 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 1kg to the slit housing.

Optical benchOptimized Czerny-Turner with one input and two outputs
Spectral range- typical 180 – 3600nm (see the specifications below), - extended up to 40µm (upon request)
F/Number1 : 3.8
Focal length, mm284
Flat field, mm30 x 10
ImagingOption. Available for the both output ports simultaneously
Gratings50x50x10mm, one grating or a turret with 4 gratings from the list below1)
- lines/mm1)240018001200600400300
- reciprocal linear dispersion (average), nm/mm2)1.582.123.186.376.329.69.4112.7512.64
- blazing wavelength, nm2252704007501000800170015002000
- spectral range, nm3)180-450180-600265-900500-1500660-1800530-16001130-27001000-30001330-3600
- multichannel array bandpass, (average), nm384)514)764)1504)805)2304)1205)1605)1605)
- resolution (average), nm <0.14) 0.056) <0.154) 0.076) <0.224) 0.16) <0.454) 0.26) <0.455) 0.26) <0.74) 0.36) <0.75)<0.945)<0.945)
Wavelength accuracy, nm±0.05±0.067±0.1±0.2±0.3±0.4
Wavelength reproducibility, nm±0.013±0.017±0.025±0.05±0.075±0.1
Step of grating rotation, nm0.0070.0090.0130.0260.040.05
Scanning speed, nm/s12.516.7255075100
Entrance/exit slitsAutomatic and manual adjustment
Slit width, mm0 - 2
Slit height, mm12
Parallelism, m+/- 1
Micrometer reading accuracy, m+/- 1
Step size, m0.5
Precision, m+/- 10
Filter wheelAutomatic switching
Max number of filters8
Standard number of filters5
Filter size, mm20
Light aperture, mm18
Integrated shutterComputer controlled, serves for measuring dark signal
Computer interfaceHigh-Speed USB
Dimensions, mm 410 x 252 x 213
Weight, kg23.5

1) Upon your request, diffraction gratings with another lines quantity/blazing angle can be used.

2) Reciprocal linear dispersion is indicated for blazing wavelength.

3) Wavelength range for which diffraction efficiency exceeds 40%.

4) For detector with 24µm pixel size and 24.5 mm active area.

5) For detector with 25µm pixel size and 12.8 mm active area.

6) For detector with 8µm pixel size and 29.1 mm active area.

The M266 monochromator-spectrograph has a wide range of options and accessories ensuring efficient collection of light from the sample located at a finite distance and in infinity, delivering light 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.

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 your monochromator-spectrograph that best meets the requirements of your instrument complex.

Multi-channel CCD detectors


The unique vacuum technology UltravacTM; deep thermoelectric cooling (down to -100C)
Multichannel CCD detectors by ANDOR Technology TM
iVac Series, Spectroscopic CCD DR 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
iDus Series, Spectroscopic CCD DV 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.
Newton Series, EMCCD DU970P-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
iStar Series, Gated iCCD DH320T-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 CCD S7030-1006 sensor, non-cooled, spectral range 200-1100nm, 1024x64 pixels, pixel size 24x24m, image area 24.6x1.4mm, 16 bit digitisation
UC-16H7307, Spectroscopic CCD S7030-1007 sensor, non-cooled, spectral range 200-1100nm, 1024x128 pixels, pixel size 24x24m, image area 24.6x2.9mm, 16 bit digitisation
UC-16H7316, Spectroscopic CCD S7031-1006 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 CCD S7031-1007 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 CCD S7031-1008 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 sensor G9204-512D 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 sensor G9212-512S 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 sensor G9214-512S 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 sensor G9208-256W 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-12T3 TCD1304 image sensor, spectral range 190-1100nm, non-cooled, 3648 pixels, pixel width 8m, image area 29.18x0.2mm, 14 bit digitisation
UC-12T2 TCD1205 image sensor, spectral range 200-1100nm, non-cooled, 2048 pixels, pixel width 14m, image area 28.672x0.2mm,14 bit digitisation
UC-14H83 S8378-1024Q image sensor, spectral range 200-1100nm, non-cooled, 1024 pixels, pixel width 25m, image area 25.6x0.2mm,14 bit digitisation
U2C-16H11156 S11156-2048-01 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

OPTICAL BENCH FEATURES

The M266 monochromator-spectrograph is built on a modified Czerny-Turner bench, in which the entrance slit and the exit slit (the center of the spectrum) are arranged asymmetrically with respect to the diffraction grating. While developing an optical bench, this arrangement of optical components allows to considerably compensate aberrations inherent to spectral instruments with spherical mirrors, and to obtain the best spectral resolution.

In contrast to the broad range of monochromators, whose mechanisms of scanning and changing of diffraction gratings are combined, the M266 uses separate control for scanning and changing of gratings. As a result, an axis of grating rotation is the axis passing through the center of the grating. This design feature, together with the optimisation of linear and angular characteristics of the optical system, has allowed to completely eliminate beam re-reflections on optical elements, to provide extremely low stray light and create a perfect flat field for a multi-element detector.

The flat field, in its turn, enables high-quality program sewing of spectra obtained with the multi-element detector by means of several scans.

Astigmatism compensation (Imaging option)

The astigmatism compensator is a cylindrical mirror which is installed after the entrance slit instead of a flat rotating mirror and provides astigmatism compensation for both output ports (the Imaging version).

Astigmatism is common to all spectral instruments; this is a phenomenon when the point on the entrance slit is displayed in the image plane as a vertical segment. The M266 astigmatic segment is 2.4mm in the center of its output flat field, and respectively 2.1mm and 2.8mm at the edges of the field. Astigmatism does not usually impair resolution of the instrument, but, depending on the height of the detector used, can affect the overall sensitivity of the system.

Astigmatism correction is imperative in a multichannel spectroscopy, in case you need to adequately transfer the light distribution along the slit, as well as for the use of spectrographs with two-dimensional detectors in the Imaging mode.

Introducing the astigmatism compensator in the M266 optical scheme allows correcting astigmatism in the exit slit plane to the value of about 50 micrometers. This fact must be considered when estimating the expected optical resolution of an instrument with a specific grating. Astigmatism compensation also affects the vertical magnification of the spectrograph:

M266 magnification Horizontal magnification Vertical magnification
without astigmatism compensation (Standard mode) 1.19 1.32
with astigmatism compensation (Imaging mode) 1.19 1.55

SPECTRA ACQUIRED WITH THE M266

1. Singlet oxygen spectra*

Emission spectrum of singlet oxygen in the 1268nm band in the supersonic flow. The M266 with the 400 lines/mm grating and the multi-channel InGaAs detector G9212-512S, entrance slit width 50m

Fig. 2. Emission spectrum of singlet oxygen at the gas generator output. The M266 with the 400 lines/mm grating and the multi-channel InGaAs detector G9212-512S, entrance slit width 400m

Fig. 3. Oxygen emission spectrum in the bands 634nm and 703nm, arising from the collision of two singlet-oxygen molecules with their transition to the ground state, one molecule becoming vibrationally excited. The M266 with the 600 lines/mm grating and multi-channel InGaAs detector G9212-512S, entrance slit width 50 m

Fig. 4. The peak on the left is the spectrum arising from collision of two singlet-oxygen molecules with their transition to the ground state. The right spectrum in the 763nm band is emission of oxygen in the second electronically excited state

* Courtesy of Lebedev Physical Institute of the Academy of Sciences, Samara Branch, Samara, Russia.

2. Emission spectra. Quadruplet Fe at 310nm

Fig. 5. Fe quadruplet, spectral lines 309.9897nm, 309.9971nm, 310.0304nm and 310.0666nm. The spectrum was acquired with spark excitation using the M266 with 1800 lines/mm grating. The possibility of resolving at least 3 peaks demonstrates high optical quality of the instrument