Cryogenic afocal beam expander using two single-piece Cassegrain mirrors

Darell E. Engelhaupt; Chen Feng; John D. Cernosek

doi:10.1117/12.188652

17 October 1994 Cryogenic afocal beam expander using two single-piece Cassegrain mirrors

Darell E. Engelhaupt, Chen Feng, John D. Cernosek

Proceedings Volume 2269, Infrared Technology XX; (1994) https://doi.org/10.1117/12.188652
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

Focal plane array research is constrained by the fact that versatile, modular test stations are not available commercially. Typical imaging detector tests mandate fabrication of expensive unique image coupling devices simulating the actual systems under consideration. Stray light and field of view are often not well controlled during tests, leading to lowered signal-to-noise levels and ambiguity regarding performance of an actual system. The University of Alabama in Huntsville has developed an inexpensive process for producing image coupling devices suitable for testing and developing cooled focal plane array systems. Model image couplers for cryogenically cooled focal plane array detector research have been produced by this process. Electrodeposition procedures and precision single point diamond machining, combined with optical design procedures permit fabrication of unique optical systems. Aspheric designs are used permitting excellent control of distortion. Applications include laboratory and field studies of beam expanders, broadband and thermal image couplers suitable for non-contact measurement, IR spectroscopy and durable lightweight telescopes which image on focal plane arrays. Low cost deployable systems are also candidates for this technology.

Citation Download Citation

Darell E. Engelhaupt, Chen Feng, and John D. Cernosek "Cryogenic afocal beam expander using two single-piece Cassegrain mirrors", Proc. SPIE 2269, Infrared Technology XX, (17 October 1994); https://doi.org/10.1117/12.188652

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KEYWORDS

Mirrors

Sensors

Image processing

Staring arrays

Beam expanders

Reflectivity

Imaging systems

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