Mr. Owen Y. Loh Profile

Owen Y. Loh

at Northwestern Univ

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Proceedings Article | 30 September 2004 Paper

Spartan infrared camera: high-resolution imaging for the SOAR Telescope

Edwin Loh, Jason Biel, Jian-Jun Chen, Michael Davis, Rene Laporte, Owen Loh

Proceedings Volume 5492, (2004) https://doi.org/10.1117/12.551808

KEYWORDS: Mirrors, Sensors, Telescopes, Cameras, Clocks, Infrared cameras, Aluminum, Off axis mirrors, K band, Nitrogen

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The Spartan Infrared Camera provides tip-tilt corrected imaging for the SOAR Telescope in the 1-2.5μm spectral range with four 2048x2048 HAWAII2 detectors. The median image size is expected to be less than 0.25 arcsec (FWHM), and in the H and K bands a significant amount of the light is expected to be in a core having the diffraction-limited width. The camera has two plate scales: 0.04 arcsec/pixel (f/21) for diffraction-limited sampling in the H and K bands and 0.07 arcsec/pixel (f/12) to cover a 5×5 arcmin² field, over which tip-tilt correction is substantial. Except for CaF2 field-flattening lenses, the optics is all reflective to achieve the large field size and achromaticity, and all aluminum to match thermally the aluminum cryogenic-optical box in which the optics mount. The Strehl ratio of the camera itself is 0.95-1.00 for the f/21 channel. The optics (including the off-axis aspherical mirrors) will be aligned with precise metrology rather than adjusted using interferometry.

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