Spex 1680B 0.22m Double Spectrometer Double Monochromator

Gratings:
300 lines/mm 2.0 micron blaze, 1 grating is in good condition the other has finger print type marks and potentially a scratch.

Datasheet:
http://www.horiba.com/fileadmin/uploads/Scientific/Documents/OSD/1680.pdf

Control: No controllers or software for this unit. The motor driver is inside the system. Possible to do independent control of the system.

Alignment: The vertical alignment is a bit askew. The 2nd half of the system is misaligned a bit from true to compensate for the 1st half being a little out of alignment. The horizontal alignment seems to be better, but it is harder to tell due to the grating spread.

Condition: All of the optics have some amount of dust on them. Additionally, the first grating has some finger print type marks as well as either a scratch or a fiber that won't vacuum away. The first pair of 2" mirrors have tiny nicks on their outside edges (< 1 mm). There are only 5 of the 6 top cover screws. The apertures seem to have their full range of motion. The foam on the inside of the cover is degraded and about to disintegrate. Visually everything else in the system does not appear to have any problems.

Reading: The discrepancy between the output wavelength and the listed front panel wavelength is due to the fact that the above datasheet mentions that the front panel output is calibrated for a 1200 lines/mm density grating and the current gratings are 300 lines/mm.


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