M140 Monochromator/Spectrograph
The M140 is a high-aperture (F=1:3.6), short-focal-length (f=145mm) monochromator/spectrograph, ideally suited for the widest range of tasks that do not require high spectral resolution.
Depending on its intended purpose, the M140 can be supplemented with a light source for use as a tunable illuminator, or equipped with a CCD, PMT, and signal collection devices for radiation registration purposes.
• Fluorescence spectroscopy
• Emission analysis with spark, arc, and laser excitation (LIBS)
• Reflection and transmittance measurements
• Multichannel (Imaging) spectroscopy
• Tunable light sources
• Metrological systems for analyzing the spectral characteristics of light sources and detectors
depends on the intended purpose, is approved at the order placement stage, and may include:
- One Input port contains an automated shutter for dark signal subtraction;
- Imaging astigmatism compensation for both output ports (option);
- Up to two output ports with the possibility of installing either spectral slits or multi-element detectors;
- Up to 3 diffraction gratings on an automated turret;
- Order-sorting filter turret for operation in the spectral range from 180nm to 2500nm;
- Choice of optics – for operation in the UV-NIR range, or for the far IR region;
- Linear and array image sensors, single-element detectors;
- Optical-mechanical assemblies for collecting radiation from a sample and focusing into an optical fiber, for inputting radiation from a fiber into the monochromator, for forming beams at the monochromator output, for focusing into an optical fiber, etc.;
- Aberration-free mirror condensers for focusing light source radiation onto the entrance slit of the monochromator without using optical fibers;
- Connector for optional inert gas purge. Purge is recommended when operating in the UV spectral region of 180-220nm to eliminate the effect of radiation absorption by oxygen present in the air.
Astigmatism compensation (Imaging)
High-end optics and aperture size provide low stray light enhancing the quality of the obtained spectroscopic data. With standard optics, a vertical line segment is formed in the plane of the exit slit from a conditional point on the entrance slit of the monochromator. For the M140 monochromator, the size of this aberration-induced line segment is 7 mm.
For low-signal applications, we offer Imaging optics to correct astigmatism in order to increase system sensitivity. The size of the residual aberration segment for the M140 in the Imaging configuration is 100 μm. Both two output ports have astigmatism correction. It should be noted that the use of Imaging optics may be accompanied by some degradation of resolution.
The unified Photonics.SP software
is used to control the monochromator and detectors and includes all the functions necessary for operation:
- automatic scanning
- automatic switching of diffraction gratings and filters
- adjustments of slit width
- input and output ports selection
- automatic background subtraction using automatic shutter
- connection of monochromator with multichannel and singe-channel detectors from specification; registration parameters setting
- registration, editing and processing of spectra
- automatic software stitching of spectral segments recorded by a multi-element detector at different positions of the diffraction grating; automatic calculation of the number of scans and grating positions depending on the specified spectral range.
- ability to create, save, and edit additional user-defined wavelength calibration;
- operation of detectors in forward and reverse synchronization mode with configured parameters;
- data saving, as well as export of spectra in CSV, BMP, and PNG formats;
- DLL and SDK are part of the standard M140 package.
М140 sizes
Specification
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Optical scheme |
Optimized Czerny-Turner with one input and two outputs |
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Spectral range |
190 – 12 000 nm (depends on the chosen diffraction gratings) |
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Aperture ratio |
1 : 3.6 |
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Focal length, mm |
145 |
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Flat field, mm |
30 x 10 |
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Input port |
1 |
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Output port |
Up to 2 |
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Imaging (astigmatism compensation) |
Option, available for the output ports |
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Vertical magnification (standard optics) |
1.0 |
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Vertical magnification (Imaging optics) |
1.4 |
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Entrance and Exit Slits |
Automatic and manual controlled |
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- slit width, mm |
0 – 2 (0 – 5 available optionally) |
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- slit height, mm |
12 |
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- parallelism, um |
+/- 1 |
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- micrometer reading accuracy, um |
2 (5 um for the 5 mm slit width) |
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- step size, um |
0.1 |
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- precision, um |
+/- 5 (12.5 for the 5 mm slit width) |
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Filter wheel |
8 positions, 5 filters Ø20mm, automatic controlled |
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Intergrated shutter |
Software controlled, for the dark signal measuring |
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Computer interface |
High-Speed USB |
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Size, mm3 |
264×214×211 |
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Diffraction gratings
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Diffraction gratings1) |
40x40x10mm, automated turret, up to 3 gratings in the set |
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- lines per mm |
2400 |
1800 |
1200 |
600 |
600 |
300 |
150 |
150 |
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- blazed at, nm |
250 |
270 |
400 |
750 |
1000 |
1500 |
4500 |
475 |
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- spectral range2) , nm |
190-450 |
190-540 |
266-800 |
500-1500 |
660-2000 |
1000-3000 |
3000-9000 |
310-950 |
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- mechanical range, nm |
0 – 500 |
0 – 650 |
0 – 1000 |
0 – 2000 |
0 – 2000 |
0 – 4000 |
0 – 8000 |
0 – 8000 |
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- reciprocal linear dispersion (average)3), nm/mm |
2.4 |
3.23 |
4.9 |
9.9 |
9.5 |
19.8 |
37 |
44 |
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- spectral resolution (average)3), nm |
0.084) <0.175) |
0.114) <0.235) |
0.164) <0.355) |
0.324) <0.75) |
0.314) <0.76) |
<1.56) |
<1.87) |
1.84) <3.25) |
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- multichannel array bandpass (average)3), nm |
68.54) 58.65) |
92.54) 795) |
1404) 1205) |
2834) 2425) |
2724) 126.55) |
253 6) |
- |
12604)10755) |
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- accuracy, nm |
±0.05 |
±0.07 |
±0.1 |
±0.2 |
±0.2 |
±0.4 |
±0.8 |
±0.8 |
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- repeatability, nm |
±0.025 |
±0.04 |
±0.05 |
±0.1 |
±0.1 |
±0.2 |
±0.4 |
±0.4 |
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1) Or other diffraction grating on request
2) Spectral range with diffraction efficiency more than 40%
3) Rec.lin.dispersion, bandpass and resolution are indicated for the wavelength in blaze
4) For detector with 7um pixel size and 28.672mm active area (Hamamatsu S13496)
5) For detector with 24um and 24.5mm area size
6) For detector with 25um and 12.8mm area size
7) For single-channel detector with 10um slit width