MS750
Description
Specification
Configurations
Diffraction gratings
Specification of monochromator-spectrograph MS750
Dimensional drawing of MS750 series monochromator-spectrograph
Dimensional drawing of MS750 monochromator-spectrograph

Optical system

Optical scheme:Cherny-Turner
(astigmatism-compensated in models MS7501i and MS7504i)
Ports:1 input, 2 output
Wavelength range:185 nm – 60 µm (depends on the type of grating)
F/number (entrance):1/8.9
Focal length (output):750 mm
Scanning range limited by the grating rotation angle*:0 – 1270 nm
Main mirrors:spherical
Stray light:5.5 х 10-7 (20 nm from laser line 632.8 nm)
Focal plane:28 х 10 mm
  • Optical scheme: Cherny-Turner (astigmatism-compensated in models MS7501i and MS7504i).
  • Ports: 1 input, 2 output.

  • Wavelength range: 185 nm — 60 µm (depends on the type of grating).

  • F/number (entrance): 1/8.9.
  • Focal length (output): 750 mm.
  • Scanning range limited by the grating rotation angle*: 0 — 1270 nm.
  • Main mirrors: spherical.

  • Stray light: 5.5 х 10-7 (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 of the device;
  • 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 MS7504i and MS7501i).

Imaging

Model:MS7501MS7504MS7501iMS7504i
Horizontal magnification:1.051.051.051.05
Vertical magnification:1.1251.125
Vertical spatial resolution:< 15 µm< 15 µm
  • Model MS7501: horizontal magnification = 1.05
  • Model MS7504: horizontal magnification = 1.05
  • Model MS7501i: horizontal magnification = 1.05; vertical magnification = 1.125; vertical spatial resolution less than 15 µm
  • Model MS7504i: horizontal magnification = 1.05; vertical magnification = 1.125; vertical spatial resolution less than 15 µm
Spectral image obtained with imaging monochromator-spectrograph MS7504i
Enlarged part of the spectral image obtained with MS7504i
Spectral image obtained with imaging monochromator-spectrograph MS7504i (diffraction grating 1800 l/mm, light source – mercury-helium lamp, pixel size of CCD detector 24×24 µm). 1 – spectral image in full; 2 – enlarged part of the original image.

Optics characteristics

Type of grating:1200 l/mm, λ = 546 nmEchelle, 75 l/mm,
λ = 200 nm, 120 order
Reciprocal linear dispersion:1.02 nm/mm0.055 nm/mm
Spectral resolution:
PMT (slit width 10 µm):0.015 nm0.0008 nm
Digital camera (12 µm pixel, slit width 15 µm):0.02 nm0.0011 nm
Repeatability:± 0.007 nm± 0.0009 nm
Wavelength accuracy:± 0.034 nm± 0.0045 nm
Average scanning step:0.0017 nm
Scanning step at 200 nm:2.25 х 10-4 nm
  • Grating 1200 l/mm, λ = 546 nm: reciprocal linear dispersion = 1.02 nm/mm, spectral resolution of PMT (slit width 10 µm) = 0.015 nm, spectral resolution of digital camera (12 µm pixel, slit width 15 µm) = 0.02 nm, repeatability = ±0.007 nm, wavelength accuracy = ±0.034 nm, average scanning step = 0.0017 nm.
  • Grating Echelle, 75 l/mm, λ = 200 nm, 120 order: reciprocal linear dispersion = 0.055 nm/mm, spectral resolution of PMT (slit width 10 µm) = 0.0008 nm, spectral resolution of digital camera (12 µm pixel, slit width 15 µm) = 0.0011 nm, repeatability = ±0.0009 nm, wavelength accuracy = ±0.0045 nm, scanning step at 200 nm = 2.25 х 10-4 nm.

Drive specifications

Motor:microstepper
Drive:sine
Step size:0.22 arc seconds
Precision:± 1 step
Maximal speed:10000 steps/s
  • Motor: microstepper.
  • Drive: sine.
  • Step size: 0.22 arc seconds.
  • Precision: ± 1 step.
  • Max. speed: 10000 steps/s.

Diffraction gratings

Size of grating:80 х 70 х 10 mm
Rotation method:about the center of grating working surface
Mounting of gratings in models MS7504 and MS7504i:automated 4-grating turret
Mounting of gratings in models MS7501 and MS7501i:positioner for 1 manually changeable grating
Grating repeatability for the automated 4-grating turret (models MS7504 and MS7504i):
wavelength*:± 0.03 nm
vertical image:
typical± 35 µm
maximal± 50 µm
Grating repeatability for 1 manually changeable grating (models MS7501 and MS7501i):
wavelength*:± 0.05 nm
vertical image:± 50 µm
  • Size of grating: 80 х 70 х 10 mm.
  • Rotation method: about the center of grating working surface.
  • Mounting of gratings in models MS7504 and MS7504i: automated 4-grating turret.
  • Mounting of gratings in models MS7501 and MS7501i: positioner for 1 manually changeable grating.
  • Grating repeatability for the automated 4-grating turret (models MS7504 and MS7504i): wavelength* = ±0.03 nm; vertical image: typical = ±35 µm; maximal = ±50 µm.
  • Grating repeatability for 1 manually changeable grating (models MS7501 and MS7501i): wavelength* = ±0.05 nm; vertical image = ±50 µm.

Spectral slits

Control:automated (drive) or
manual (micrometer)
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:from 0 up to 10 mm
diaphragm-regulated
  • Control: automated (drive) or manual (micrometer).
  • 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: from 0 up to 10 mm – diaphragm-regulated.

Ports

Number of ports:1 input, 2 output
Output port repeatability (automated mirror):± 0.01 nm
Switching time (output port):10 s
  • Number of ports: 1 input, 2 output.
  • Output port repeatability (automated mirror): ± 0.01 nm.
  • Switching time (output port): 10 s.

Integrated shutter

Shut time:~100 ms
Maximal frequency:1 Hz
Control:on-board CPU or TTL-signals from the external device
  • Shut time: ~100 ms.
  • Maximal frequency: 1 Hz.
  • Control: on-board CPU or TTL-signals from the external device.

Control

Central control:on-board CPU
External control:PC
External interface:Ethernet
  • Central control: on-board CPU.
  • External control: PC.
  • External interface: Ethernet.

Dimensions

Overall sizes (L х W х H):950 х 361 х 343 mm
Weight:45 kg (may vary, depends on configuration)
  • Overall sizes (L х W х H): 950 х 361 х 343 mm.
  • Weight: 45 kg (may vary, depends on configuration).

* The characteristics are given for grating 1200 lines/mm, slit width 15 μm, wavelength 546 nm.