NP250-2M Spectrograph > SOL

 Optical scheme:

 Modified Hill scheme, astigmatism-compensated, 

 with two independent channels

 Usable wavelength range:

 185 nm ? 60 ?m (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 ?

 Horizontal magnification:

 1.09

 Vertical magnification:

 1

 Vertical spatial resolution:

 - at the center of the field:

 2 ?m

 - at 10 mm from the center of the field

 0.2 mm

 Focal plane

 25 х 8 mm

 Motor:

 Manually

 Drive:

 Worm

 Reciprocal linear dispersion:

 2.91 nm/mm

 Spectral resolution:

 - PMT (slit width 10 ?m):

 0.07 nm

 - digital cameras (14 ?m pixel):

 0.08 nm

 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, the orientation 

 of the rotation axis coincides with orientation of grating lines

 * Grating positioning repeatability:

 - across the wavelength

 ±0.02 nm

 - vertical image position:

 ±0.2 nm

 Number of ports:

 1 input, 1 output

 Control:

 Manual, with micrometer screw

 Opening width:

 Smoothly regulated from 0 up to 2.0 mm

 Parallelism:

 ± 1 ?m

 Accuracy (slit width 1 mm):

 ± 10 ?m

 Repeatability:

 ± 1 ?m

 Reading accuracy (micrometer):

 2 ?m

 Height:

 10 mm; diaphragm-regulated from 0 up to 10 mm

 Overall sizes (L x W x H):

 385 х 280 х 215 mm

 Optical height:

 111 - 120 mm

 Weight:

 10 kg