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18 November 2019 Negative thermal expansion ALLVAR alloys for athermalization (Conference Presentation)
James A. Monroe, Jeremy S. McAllister, Jay Zgarba, David Squires, John P. Deegan
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Proceedings Volume 11175, Optifab 2019; 111750R (2019) https://doi.org/10.1117/12.2536862
Event: SPIE Optifab, 2019, Rochester, New York, United States
Abstract
Temperature changes can detrimentally affect an optic’s performance due to changes in radius of curvature, thickness, and index of refraction. This is a particularly tricky problem when combinations of these changes produce a decrease in focus with increasing temperature such as infrared systems. Current solutions include active focusing mechanisms and nesting tubes of different materials that cancel each other’s thermal expansion, but these solutions add size and mass. ALLVAR alloys are the only metals that shrink when heated and expand when cooled, known as negative thermal expansion (NTE), making them a unique solution to this thermal focus shift problem. They can exhibit NTE down to -30 ppm/K. This unique property opens the opto-mechanical design window for athermalized optics with decreased size and weight. This presentation will discuss the optic design potential of ALLVAR alloys and exhibit the first optic demonstration of ALLVAR in a visible and infrared optic assembly.
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James A. Monroe, Jeremy S. McAllister, Jay Zgarba, David Squires, and John P. Deegan "Negative thermal expansion ALLVAR alloys for athermalization (Conference Presentation)", Proc. SPIE 11175, Optifab 2019, 111750R (18 November 2019); https://doi.org/10.1117/12.2536862
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KEYWORDS
Infrared radiation
Infrared imaging
Metals
Optical design
Optomechanical design
Refraction
Temperature metrology
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