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Compact indium seal for cryogenic optical windows

Compact indium seal for cryogenic optical windows The design of a novel, low profile indium seal for cryogenic optical windows is presented. Such a seal may be suitable to applications where restrictions on available space surrounding the window prevent the use of conventional approaches. The seal is applicable to asymmetric window geometries which can exhibit nonuniformity in mechanical stress that is sufficient to prevent the use of other sealing techniques. A seal between a non-circular germanium window and a metal frame has been fabricated. Modelling and experimental results for selected aspects of the seal design are given. In order to establish the effective life of the new seal, an apparatus has been developed which performs repetitive cycling between room and liquid nitrogen temperatures. Details of the apparatus are provided. The germanium window to metal frame seal has successfully withstood more than 200 such cycles with no detectable leak. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Proceedings of SPIE SPIE
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