Specification of monochromator-spectrograph MS520 • SOL instruments

Optical system

Optical scheme:	Cherny-Turner (astigmatism-compensated in models MS5201i and MS5204i)
Ports:	1 input, 2 output
Wavelength range:	185 nm – 60 µm (depends on the type of grating)
F/number (entrance):	1/5.4
Focal length (output):	520 mm
Scanning range limited by the grating rotation angle*:	0 – 1580 nm
Main mirrors:	spherical
Stray light:	1 х 10^-6 (20 nm from laser line 632.8 nm)
Focal plane:	28 х 10 mm

Optical scheme: Cherny-Turner (astigmatism-compensated in models MS5201i and MS5204i).
Ports: 1 input, 2 output.
Wavelength range: 185 nm — 60 µm (depends on the type of grating).
F/number (entrance): 1/5.4.
Focal length (output): 520 mm.
Scanning range limited by the grating rotation angle*: 0 – 1580 nm.
Main mirrors: spherical.
Stray light: 1 х 10^-6 (20 nm from laser line 632.8 nm).
Focal plane: 28 х 10 mm.

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 MS5204i and MS5201i).

Model:	MS5201	MS5204	MS5201i	MS5204i
Horizontal magnification:	1.063	1.063	1.063	1.063
Vertical magnification:	–	–	1.29	1.29
Vertical spatial resolution (minimal distance between the edges of the two nearby tracks (in multichannel spectroscopy)):	–	–	< 20 µm	< 20 µm

Model MS5201: horizontal magnification = 1.063.
Model MS5204: horizontal magnification = 1.063.
Model MS5201i: horizontal magnification = 1.063; vertical magnification = 1.29; vertical spatial resolution (minimal distance between the edges of the two nearby tracks (in multichannel spectroscopy)) < 20 µm.
Model MS5204i: horizontal magnification = 1.063; vertical magnification = 1.29; vertical spatial resolution (minimal distance between the edges of the two nearby tracks (in multichannel spectroscopy)) < 20 µm.

Type of grating:	1200 l/mm, λ = 546 nm	Echelle, 75 l/mm, λ = 200 nm, 120 order
Reciprocal linear dispersion:	1.55 nm/mm	0.11 nm/mm
Spectral resolution:
PMT (slit width 10 µm):	0.028 nm	0.0020 nm
Digital camera (12 µm pixel):	0.034 nm	0.0024 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^-4nm

Grating 1200 l/mm, λ = 546 nm: reciprocal linear dispersion = 1.55 nm/mm, spectral resolution of PMT (slit width 10 µm) = 0.028 nm, spectral resolution of digital camera (12 µm pixel) = 0.034 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 = 0.11 nm/mm, spectral resolution of PMT (slit width 10 µm) = 0.0020 nm, spectral resolution of digital camera (12 µm pixel) = 0.0024 nm, repeatability = ±0.0009 nm, wavelength accuracy = ±0.0045 nm, scanning step at 200 nm = 2.25 х 10^-4nm.

Motor:	stepper, with fractional steps
Drive:	sine
Step size:	0.22 arc seconds
Precision:	± 1 step
Maximal speed:	10000 steps/s

Size of grating:	80 x 70 x 10 mm
Rotation method:	about the center of grating working surface
Mounting of gratings in models MS5204 and MS5204i	automated 4-grating turret
Mounting of gratings in models MS5201 and MS5201i	positioner for 1 manually changeable grating
Grating repeatability for automated 4-grating turret (models MS5204 and MS5204i):
wavelength*:	± 0.02 nm
vertical image:
typical	± 25 µm
maximal	± 35 µm
Grating repeatability for positioner for 1 manually changeable grating (models MS5201 and MS5201i):
wavelength*:	± 0.05 nm
vertical image:	± 35 µm

Size of grating: 80 x 70 x 10 mm.
Rotation method: about the center of grating working surface.
Mounting of gratings in models MS5204 and MS5204i: automated 4-grating turret.
Mounting of gratings in models MS5201 and MS5201i: positioner for 1 manually changeable grating.
Grating repeatability for automated 4-grating turret (models MS5204 and MS5204i): wavelength* = ±0.02 nm; vertical image: typical = ±25 µm; maximal = ±35 µm.
Grating repeatability for positioner for 1 manually changeable grating (models MS5201 and MS5201i): wavelength* = ±0.05 nm; vertical image = ±35 µm.

Type of spectral slit:	Automated (combined)	Manual
Control:	automated (drive) or manually (micrometer)	manually (micrometer)
Width:	regulated from 0 up to 2.0 mm	regulated from 0 up to 2.0 mm
Parallelism:	± 1 µm	± 1 µm
Accuracy (slit 1 mm):	± 10 µm	± 10 µm
Repeatability:	± 1 µm	± 1.5 µm
Reading accuracy (micrometer):	2 µm	2 µm
Step size (automated slit):	0.5 µm	–
Height:	from 0 to 10 mm – regulated by a diaphragm with division of 0.5 mm	from 0 to 10 mm – regulated by a diaphragm with division of 0.5 mm

Automated (combined) spectral slits: control = automated (drive) or manually (micrometer); width = regulated from 0 up to 2.0 mm; parallelism = ±1 µm; accuracy (slit 1 mm) = ±10 µm; repeatability = ±1 µm; reading accuracy (micrometer) = 2 µm; step size (automated slit) = 0.5 µm; height = from 0 to 10 mm – regulated by a diaphragm with division of 0.5 mm.
Manual spectral slits: control = manually (micrometer); width = regulated from 0 up to 2.0 mm; parallelism = ±1 µm; accuracy (slit 1 mm) = ±10 µm; repeatability = ±1.5 µm; reading accuracy (micrometer) = 2 µm; height = from 0 to 10 mm – regulated by a diaphragm with division of 0.5 mm.

Number of ports:	1 input, 2 output
Output port repeatability (automated mirror)*:	± 0.03 nm
Switching time (output port):	4 s

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

Overall sizes (L х W х H):	635 х 339 х 270 mm
Weight:	25 kg (may vary, depends on the configuration)

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