Optical testing of a membrane diffractive optic for space-based solar imaging

Olha Asmolova; Geoff Andersen; Michael E. Dearborn; Matthew G. McHarg; Trey Quiller; Thomas Dickinson

doi:10.1117/12.2037035

25 February 2014 Optical testing of a membrane diffractive optic for space-based solar imaging

Olha Asmolova, Geoff Andersen, Michael E. Dearborn, Matthew G. McHarg, Trey Quiller, Thomas Dickinson

Proceedings Volume 9006, Practical Holography XXVIII: Materials and Applications; 90060D (2014) https://doi.org/10.1117/12.2037035
Event: SPIE OPTO, 2014, San Francisco, California, United States

Abstract

We describe imaging capabilities of a 0.2 m membrane diffractive primary (DOE) used as a key element in FalconSat-7, a space-based solar telescope. Its mission is to take an image of the Sun at the H-alpha wavelength (656nm) over a narrow bandwidth while in orbit. In this case the DOE is a photon sieve which consists of billions of tiny holes, with the focusing ability dependent on an underlying Fresnel zone geometry. Uniform radial expansion/contraction of the substrate due to temperature or relative humidity change will result in a shift in focal length without introducing errors in phase of the transmitted wavefront and without a decrease in efficiency. We will also show that while ideally the DOE surface should be held flat to within 5.25 microns, an opto-mechanical analysis showed that local deformations up to 32 microns are possible without significantly degrading the image quality.

Citation Download Citation

Olha Asmolova, Geoff Andersen, Michael E. Dearborn, Matthew G. McHarg, Trey Quiller, and Thomas Dickinson "Optical testing of a membrane diffractive optic for space-based solar imaging", Proc. SPIE 9006, Practical Holography XXVIII: Materials and Applications, 90060D (25 February 2014); https://doi.org/10.1117/12.2037035

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