Spectral and radiometric calibration of WFIRST slitless spectrometer (grism) (Conference Presentation)

Qian Gong; Matthew Bergkoetter; Joshua Berrier; John Chambers; Margaret Dominguez; Wesley Fincher; John Hagopian; Catherine Marx

doi:10.1117/12.2530712

9 September 2019 Spectral and radiometric calibration of WFIRST slitless spectrometer (grism) (Conference Presentation)

Qian Gong, Matthew Bergkoetter, Joshua Berrier, John Chambers, Margaret Dominguez, Wesley Fincher, John Hagopian, Catherine Marx

Author Affiliations +

Proceedings Volume 11115, UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts IX; 1111503 (2019) https://doi.org/10.1117/12.2530712
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

Abstract

We have presented the optical design and early test result of WFIRST grism spectrometer in previous SPIE conferences. This paper reports the follow-on activity of the spectral and radiometric calibrations, including the calibration methods, experiment designs, and the light source and detector calibration. The real grism calibration includes the throughput versus wavelength, which is largely determined by the diffraction efficiency of the two diffractive surfaces. It also includes spectral resolution, point spread function, and encircle energy measurements. The measured data are presented. The comparisons between the test data and the simulation from theory, or optical model, are also presented.

Conference Presentation

Citation Download Citation

Qian Gong, Matthew Bergkoetter, Joshua Berrier, John Chambers, Margaret Dominguez, Wesley Fincher, John Hagopian, and Catherine Marx "Spectral and radiometric calibration of WFIRST slitless spectrometer (grism) (Conference Presentation)", Proc. SPIE 11115, UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts IX, 1111503 (9 September 2019); https://doi.org/10.1117/12.2530712

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