As-built optical models for the DCT

Please contact Tom Bida to request the Zemax models.

A.  For folded instrument cube ports, showing the cube and optical geometry:

  1. The unvignetted FOV of a standard fold mirror is approximately 2.5 arcmin circular diameter.
  2. The back focus from the instrument mounting flanges for folded cube ports is 180mm.
  3. The RC plate scale is 8 arcsec/mm.
  • DCT_RC_FoldMirror.ZMX

B.  For the RC corrector, with LMI including the dual filter wheel, and surface points for the cube structure and components. 

The 2-element corrector has the following characteristics:

  1. The 2 lenses are fabricated of fused silica, with transmission of 98.5% from 300-1100nm.
  2. The corrected, unvignetted FOV is 0.5 deg diameter, with 0.03% differential distortion over this FOV.
  3. The AR coatings provide average reflectance of 0.84% from 300-1100nm, with < 0.025% additive ghost-reflection sky background.
  4. The modeled spot size is 4.2-6.4 microns RMS (< 0.082 arcsec FWHM) over the LMI FOV (0.205 deg square), for B through I-bands.

The LMI CCD is a deep-depletion e2v CCD-231-C6, 6K x 6K 15 micron pixels, coated with a 4-layer Astro AR coating.  The plate scale is 0.12 arcsec/pixel.

  • DCT_RCC_LMI.ZMX

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