Dimensional drawing of MS200 monochromator-spectrograph
Optical system
| Optic layout: | Cherny-Turner (astigmatism-compensated in models MS2001i and MS2004i) |
| Ports: | 1 input and 2 output |
| Wavelength range: | 185 nm – 60 µm (determined by used gratings) |
| F/number (entrance): | 1/3.6 |
| Focal length (output): | 200 mm |
| Scanning range limited by the grating rotation angle*: | 0 – 1300 nm |
| Basic mirrors: | spherical |
| Stray light: | 3 х 10-5 (20 nm from laser line 632.8 nm) |
| Focal plane: | 26 х 10 mm |
- Optic layout: Cherny-Turner (astigmatism-compensated in models MS2001i and MS2004i).
- Ports: 1 input and 2 output.
- Wavelength range: 185 nm — 60 µm (determined by used gratings).
- F/number (entrance): 1/3.6.
- Focal length (output): 200 mm.
- Scanning range limited by the grating rotation angle*: 0 — 1300 nm.
- 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
| Model: | MS2001 | MS2004 | MS2001i | MS2004i |
|---|---|---|---|---|
| Horizontal magnification: | 1.06 | 1.06 | 1.06 | 1.06 |
| Vertical magnification: | – | – | 1.48 | 1.48 |
| Vertical spatial resolution: | – | – | < 40 µm | < 40 µm |
Model MS2001: horizontal magnification = 1.06
Model MS2004: horizontal magnification = 1.06
Model MS2001i: horizontal magnification = 1.06; vertical magnification = 1.48; vertical spatial resolution less than 40 µm
Model MS2004i: horizontal magnification = 1.06; vertical magnification = 1.48; vertical spatial resolution less than 40 µm
Spectral image obtained with Imaging monochromator-spectrograph MS2004i (diffraction grating 1200 l/mm, light source – mercury-helium lamp, multi-channel fiber bundle, fiber core diameter 200 µm, CCD pixel size 24×24 µm). 1 – acquired spectral image in full; 2 – zoomed in part of the spectral image.
Optics characteristics*
| Reciprocal dispersion: | 4.12 nm/mm |
| Spectral resolution: | |
| PMT (slit width 10 µm): | 0.11 nm |
| Digital camera (12 µm pixel): | 0.12 nm |
| Repeatability: | ± 0.036 nm |
| Wavelength accuracy: | ± 0.07 nm |
| Average scanning step: | 0.012 nm |
- Reciprocal dispersion: 4.12 nm/mm
- Spectral resolution: PMT (slit width 10 µm) = 0.11 nm; digital camera (12 µm pixel) = 0.12 nm
- Repeatability: ± 0.036 nm
- Wavelength accuracy: ± 0.07 nm
- Average scanning step: 0.012 nm
Drive specifications
| Motor: | micro-stepper |
| Drive: | worm |
| Step size: | 1.6 arc seconds |
| Precision: | ± 1 step |
| Maximal speed: | 10000 steps/s |
- Motor: micro-stepper.
- Drive: worm.
- Step size: 1.6 arc seconds.
- Precision: ± 1 step.
- Max. speed: 10000 steps/s.
Diffraction gratings
| Size: | 40 x 40 x 6 mm |
| Rotation: | about the center of grating working surface |
| Mounting in models MS2004 and MS2004i: | automated 4-grating turret |
| Mounting in models MS2001 and MS2001i: | positioner for 1 manually changeable grating |
| Grating repeatability for the automated 4-grating turret (models MS2004, MS2004i): | |
| wavelength*: | ± 0.03 nm |
| vertical image: | ± 40 µm |
| Grating repeatability for 1 manually changeable grating holder (models MS2001, MS2001i): | |
| wavelength*: | ± 0.05 nm |
| vertical image: | ± 40 µm |
- Size: 40 x 40 x 6 mm.
- Rotation: about the center of grating working surface.
- Mounting in models MS2004 and MS2004i: automated 4-grating turret.
- Mounting in models MS2001 and MS2001i: positioner for 1 manually changeable grating.
- Grating repeatability for the automated 4-grating turret (models MS2004, MS2004i): wavelength* = ± 0.03 nm; vertical image = ± 40 µm.
- Grating repeatability for 1 manually changeable grating holder (models MS2001, MS2001i): wavelength* = ± 0.05 nm; vertical image = ± 40 µm.
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: | 0.5 µm |
| Height: | diaphragm-regulated from 0 up to 10 mm |
- 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 (automated slot): 0.5 µm.
- Height: diaphragm-regulated from 0 up to 10 mm.
Ports
| Number of ports: | 1 input, 1 or 2 output |
| Wavelength reproducibility of output port positioning (automated mirror)*: | ± 0.03 nm |
| Output port switching time: | 5 sec |
- Number of ports: 1 input, 1 or 2 output.
- Wavelength reproducibility of output port positioning (automated mirror)*: ± 0.03 nm.
- Output port switching time: 5 sec.
Integrated shutter
| Shut time: | ~100 ms |
| Maximal frequency: | 1 Hz |
| Control: | on-board CPU |
- Shut time: ~100 ms.
- Maximal frequency: 1 Hz.
- Control: on-board CPU.
Control
| Central: | on-board CPU |
| External: | PC |
| External interface: | Ethernet |
- Central: on-board CPU.
- External: PC.
- External interface: Ethernet.
Overall sizes
| Overall sizes (L х W х H): | 300 х 200 х 160 mm |
| Weight: | 9 kg (standard configuration) |
- Overall sizes (L х W х H): 300 х 200 х 160 mm.
- Weight: 9 kg (standard configuration).
* The characteristics are given for grating 1200 lines/mm, slit width 15 μm, wavelength 546 nm.