產品介紹
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MS350
產品說明
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MS350 Series monochromators–spectrographs a general-purpose instruments which can be used as monochromators or spectrographswith 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.
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I M A G I N G
Theory & Instructions |
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.
產品規格
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
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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 24x24 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 2. Positioner for 1 manually changeable grating (модели MS3501 и MS3501i) |
| Grating repeatability for the automated 4-grating turret (models MS3504, MS3504i) |
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| - 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) |
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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) |
