NP250-2 Spectrograph

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Optical system

Optical scheme: Modified Hill scheme, astigmatism-compensated, with two independent channels
Usable wavelength range: 185 nm – 60 µm (depends on the type of grating)
F/number:  
- common: 1/4.2
- for each channel: 1/6.1
Focal length: 270 mm
Scanning range limited by the grating rotation angle (grating 1200 l/mm): 0 - 1280 nm
Main mirrors:  Off-axis parabolic
Stray light (20 nm from laser line 632.8 nm)  2.5*10-5 

Astigmatism compensation:

Horizontal magnification: 1.09
Vertical magnification: 1
Vertical spatial resolution:  
- at the center of the field: 2 µm
- at 10 mm from the center of the field: 0.2 mm
Focal plane: 25 х 8 mm

Drive:

Motor: Micro-stepper
Drive: Worm
Step size: 1.62 arc seconds
Accuracy: ±1 step
Max. speed: 10 000 steps/s

* Optics:

Reciprocal linear dispersion: 2.91 nm/mm
Spectral resolution:  
- PMT (slit width 10 µm): 0.07 nm
- digital cameras (14 µm pixel): 0.08 nm
Wavelength repeatability: ±0.03 nm
Wavelength accuracy: ±0.06 nm
Wavelength step size: 0.01 nm

* For grating 1200 l/mm, wavelength 546 nm, detector pixel size 24 µm

Gratings:

Number of changeable gratings unlimited
Number of simultaneously installed gratings 2
Size: 50 х 40 х 10 mm
Fixation: Positioner for 1 manually changeable grating
Rotation:

About the center of grating working surface

* Grating positioning repeatability:

 

- across the wavelength:

±0.02 nm

- vertical image position:

±0.2 mm

* For grating 1200 l/mm, wavelength 546 nm

Ports:

Number of ports: 1 input, 2 output
* Output port repeatability across the wavelength: ±0.03 nm
Switching time: 30 s

* For grating 1200 l/mm, wavelength 546 nm

Spectral slits:

Control: Automated (stepper drive); manual, with micrometer screw
Opening width: Smoothly regulated from 0 up to 2.0 mm
Parallelism: ± 1 µm
Accuracy (slit width 1 mm): ± 10 µm
Repeatability:  
- automated:  ±1 µm
- manually operated: ±1.5 µm
Reading accuracy (micrometer): 2 µm
Step size (for automated): 0.5 µm
Height: 10 mm; diaphragm-regulated from 0 up to 10 mm

Control:

Central: on-board CPU
External: PC
Interface: Ethernet

Dimensions:

Overall sizes  (L x W x H): 510 х 280 х 215 mm
Optical height: 111 - 120 mm

Weight:

14 kg

Electrical requirements:

110 - 230 V 50/60 Hz

Power consumption:

not more than 35 W

 

Dimensional drawing:

 

Dimensional drawing NP250-2