Cryogenic mounts for large fused silica lenses

T. R. Froud; I. A. J. Tosh; R. L. Edeson; G. B. Dalton

doi:10.1117/12.670198

6 July 2006 Cryogenic mounts for large fused silica lenses

T. R. Froud, I. A. J. Tosh, R. L. Edeson, G. B. Dalton

Proceedings Volume 6273, Optomechanical Technologies for Astronomy; 62732I (2006) https://doi.org/10.1117/12.670198
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States

Abstract

This paper describes the design and development of an accurate temperature compliant lens mounting technique being used on the camera of the UK-FMOS near infrared spectrograph for operation at the Subaru Telescope in Hawaii. A series of fused silica lenses of up to 4.4kg, 255mm in diameter and operating at temperatures as low as 70K are supported within flexures cut away from stainless steel outer rings. Intermediate low thermal expansion pads are attached to these flexures and in turn bonded to the glass during the alignment process. This mounting method lends itself to the domino chips type of assembly process which can be carried out on a rotary table to maintain accurate axial alignment. A detailed description of the overall design progression including the methods of manufacture, alignment process, adhesive selection, assembly methods and testing is included.

Citation Download Citation

T. R. Froud, I. A. J. Tosh, R. L. Edeson, and G. B. Dalton "Cryogenic mounts for large fused silica lenses", Proc. SPIE 6273, Optomechanical Technologies for Astronomy, 62732I (6 July 2006); https://doi.org/10.1117/12.670198

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