MS350
Description
Specification
Configurations
Diffraction gratings
Specification of monochromator-spectrograph MS350
Dimensional drawing of MS350 monochromator-spectrograph
Dimensional drawing of MS350 monochromator-spectrograph

Optical system of MS350

Optical scheme:Cherny-Turner
(astigmatism-compensated in models MS3501i and MS3504i)
Ports:1 input, 2 output
Wavelength range:185 nm – 60 µm (depends on the type of grating)
F/number (entrance):1/3.8
Focal length (output):350 mm
Scanning range limited by the grating rotation angle*:0 – 1280 nm
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: Cherny-Turner (astigmatism-compensated in models MS3501i and MS3504i).
  • Ports: 1 input, 2 output.

  • Wavelength range: 185 nm – 60 µm (depends on the type of grating).
  • F/number (entrance): 1/3.8.
  • Focal length (output): 350 mm.
  • Scanning range limited by the grating rotation angle*: 0 – 1280 nm.
  • 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 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 MS3504i and MS3501i).

Imaging

Model:MS3501MS3504MS3501iMS3504i
Horizontal magnification:1.091.091.091.09
Vertical magnification:1.491.49
Vertical spatial resolution:< 35 µm< 35 µm
  • Model MS3501: horizontal magnification = 1.09
  • Model MS3504: horizontal magnification = 1.09
  • Model MS3501i: horizontal magnification = 1.09; vertical magnification = 1.49; vertical spatial resolution less than 35 µm

  • Model MS3504i: horizontal magnification = 1.09; vertical magnification = 1.49; vertical spatial resolution less than 35 µm
Spectral image obtained with imaging monochromator-spectrograph MS3504i
Enlarged part of the spectral image
Spectral image obtained with imaging monochromator-spectrograph MS3504i (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 – enlarged part of the original spectral image.
More information about image quality

Optics characteristics*

Reciprocal dispersion:2.37 nm/mm
Spectral resolution:
PMT:0.06 nm
Digital camera (12 µm pixel):0.07 nm
Repeatability:± 0.03 nm
Wavelength accuracy:± 0.06 nm
Average scanning step:0.01 nm
  • Reciprocal dispersion: 2.37 nm/mm
  • Spectral resolution: PMT = 0.06 nm; digital camera (12 µm pixel) = 0.07 nm
  • Repeatability: ± 0.03 nm
  • Wavelength accuracy: ± 0.06 nm
  • Average scanning step: 0.01 nm

Drive

Motor:stepper, with fractional steps
Drive:warm
Step size:1.62 arc seconds
Precision:± 1 step
Maximal speed:10000 steps/s
  • Motor: stepper, with fractional steps.
  • Drive: warm.
  • Step size: 1.62 arc seconds.
  • Precision: ± 1 step.
  • Maximal speed: 10000 steps/s.

Diffraction gratings

Size of grating:70 x 70 x 10 mm
Rotation method:about the center of grating working surface
Mounting of gratings in models MS3504 and MS3504i:automated 4-grating turret
Mounting of gratings in models MS3501 and MS3501i:positioner for 1 manually changeable grating
Grating repeatability for the automated 4-grating turret (models MS3504, MS3504i):
wavelength*:± 0.03 nm
vertical image:
typical± 50 µm
maximal± 70 µm
Grating repeatability for the holder for 1 manually changeable grating (models MS3501 and MS3501i):
wavelength*:± 0.05 nm
vertical image:± 70 µm
  • Size of grating: 70 x 70 x 10 mm.
  • Rotation method: about the center of grating working surface.
  • Mounting of gratings in models MS3504 and MS3504i: automated 4-grating turret.
  • Mounting of gratings in models MS3501 and MS3501i: positioner for 1 manually changeable grating.
  • Grating repeatability for the automated 4-grating turret (models MS3504, MS3504i): wavelength* = ± 0.03 nm; vertical image: typical = ± 50 µm; maximal = ± 70 µm
  • Grating repeatability for the holder for 1 manually changeable grating (models MS3501 and MS3501i): wavelength* = ± 0.05 nm; vertical image = ± 70 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 width 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 positioning repeatability at wavelength (automated mirror)*:± 0.03 nm
Switching time (output port):4 s
  • Number of ports: 1 input, 2 output.
  • Output port positioning repeatability at wavelength (automated mirror)*: ± 0.03 nm.
  • Switching time (output port): 4 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):510 х 395 х 200 mm
Weight:19 kg (may differ, depends on configuration)
  • Overall sizes (L х W х H): 510 х 395 х 200 mm.
  • Weight: 19 kg (may differ, depends on configuration).

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