A Submillimeter High Angular Resolution Bolometer Array Camera for the Caltech Submillimeter Observatory

Physics – Optics

Scientific paper

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Scientific paper

We have constructed a bolometer array camera optimized for the 350 micron and 450 micron atmospheric windows for the Caltech Submillimeter Observatory (CSO). The detectors are micromachined monolithic silicon thermal bolometers cooled to 300 mK by a 3He refrigerator. They form a close-packed linear array of 24 bolometers which provide Nyquist sampling of the diffraction pattern from the CSO in a strip 10"x2' on the sky. The bolometers achieve a Noise Equivalent Power of 5E-15 W/sqrt(Hz), which is approximately background limited in good Mauna Kea weather. Liquid Helium cooled optics provide the aperture and field stops and reimage the sky onto the bolometer array, eliminating the need for Winston cones. The total optical efficiency of the camera is ~10%. Several successful runs at the CSO have proven the ability of this instrument to allow significantly better and faster mapping of astronomical sources than was previously possible.

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