LCDs as Slit Masks for Multi-Object Spectroscopy

Details LCDs as Slit Masks for Multi-Object Spectroscopy LCDs as Slit Masks for Multi-Object Spectroscopy

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...204.1008k&link_type=abstract

American Astronomical Society Meeting 204, #10.08; Bulletin of the American Astronomical Society, Vol. 36, p.673

Astronomy and Astrophysics

Astronomy

Scientific paper

We have examined the feasibility of using a liquid crystal device (LCD) as an electronically generated slit mask for multi-object spectroscopy. Bench tests were performed on a stack of two scattering principle LCDs that was found to have a clear-state transmission of 44 ± 2% with a contrast ratio of 7.4 ± 0.1 magnitudes. No attention has been paid to surface losses with the current device, but the clear-state transmission, and likely the contrast ratio, will increase with the application of an anti-reflection coating to the device's glass surfaces. The opacity of this device is achieved by scattering incident light out of the beam, but even a clear slit will scatter about 3% of a point source's light in the forward direction, creating a slightly non-uniform background. We find the results of these tests encouraging and plan to continue our feasibility study by performing on-telescope tests in the near future.

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