A wide-field relay optics system for the Caltech Submillimeter Observatory.

Details A wide-field relay optics system for the Caltech Submillimeter Observatory. A wide-field relay optics system for the Caltech Submillimeter Observatory.

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997ijimw..18..273s&link_type=abstract

International Journal of Infrared and Millimeter Waves, Vol. 18, No. 2, p. 273 - 284

Astronomy and Astrophysics

Astronomy

6

Sub-Mm Astronomy: Auxiliary Instrumentation

Scientific paper

Relay optics designed for use with imaging arrays at the Caltech Submillimeter Observatory are described. An off-axis ellipsoidal mirror with foci displaced from the conjugate planes is used to achieve a Strehl ratio >0.88 over a 2' square field of view (corresponding to a far field of 15×15 diffraction beams) at a wavelength of 350 μm. The mirror also provides an aperture-stop image just prior to focus which allows compact entry into cryogenic camera dewars. Using a compensating ellipsoid in subsequent camera optics, the Strehl ratio can be improved to >0.95 at all points across the field, even for off-axis chop angles of the telescope's secondary mirror as large as 2'.

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