Large Aperture Two Mirror Collimator Diamond Machined For Electro-Optical Test

James R. Schaffer Jr.; John Casstevens; Samuel R. Lyle Jr.

doi:10.1117/12.955595

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11 October 1989 Large Aperture Two Mirror Collimator Diamond Machined For Electro-Optical Test

James R. Schaffer Jr., John Casstevens, Samuel R. Lyle Jr.

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Proceedings Volume 1113, Reflective Optics II; (1989) https://doi.org/10.1117/12.955595
Event: SPIE 1989 Technical Symposium on Aerospace Sensing, 1989, Orlando, FL, United States

Abstract

A two-mirror, off axis Cassegrain telescope was fabricated and assembled for use in making Forward Looking Infrared Receiver (FLIR) to laser boresight measurements. The collimator was designed to operate over two non-coherent bands (0.30<λ<1.10 μm and 8<λ<12 μm) and the coherent 1.06 μm line. The compact multispectral collimator applications include both static and simulated dynamic operating conditions. This paper describes the results of the element, collimator and integration tests associated with the development of this steep diamond machined system. The mirrors were diamond machined out of aluminum that was nickel plated, post polished and hard gold coated. The unobscured aperture is greater than ten inches with an effective focal length of approximately ninety four inches. The large, fast primary mirror, which is an off axis portion of an f/0.37 paraboloid, drove novel fabrication and test methods for the collimator.

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James R. Schaffer Jr., John Casstevens, and Samuel R. Lyle Jr. "Large Aperture Two Mirror Collimator Diamond Machined For Electro-Optical Test", Proc. SPIE 1113, Reflective Optics II, (11 October 1989); https://doi.org/10.1117/12.955595

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