The FIREBall-2 UV sample grating efficiency at 200-208nm

S. Quiret; B. Milliard; R. Grange; G. R. Lemaitre; A. Caillat; M. Belhadi; A. Cotel

doi:10.1117/12.2056972

25 July 2014 The FIREBall-2 UV sample grating efficiency at 200-208nm

S. Quiret, B. Milliard, R. Grange, G. R. Lemaitre, A. Caillat, M. Belhadi, A. Cotel

Proceedings Volume 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray; 914432 (2014) https://doi.org/10.1117/12.2056972
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

Abstract

The FIREBall-2 (Faint Intergalactic Redshifted Emission Balloon-2) is a balloon-borne ultraviolet spectro-imaging mission optimized for the study of faint diffuse emission around galaxies. A key optical component of the new spectrograph design is the high throughput cost-effective holographic 2400 ℓ =mm, 110x130mm aspherized reflective grating used in the range 200 - 208nm, near 28°deviation angle. In order to anticipate the efficiency in flight conditions, we have developed a PCGrate model for the FIREBall grating calibrated on linearly polarized measurements at 12° deviation angle in the range 240-350nm of a 50x50mm replica of the same master selected for the flight grating. This model predicts an efficiency within [64:7; 64:9]±0:7% (S polarization) and [38:3; 45]±2:2% (P-polarization) for the baseline aluminum coated grating with an Al₂O₃ natural oxidation layer and within [63:5; 65] ±1% (S-polarization) and [51:3; 54:8] ±2:8% (P-polarization) for an aluminum plus a 70nm MgF₂ coating, in the range 200 - 208nm and for a 28°deviation angle. The model also shows there is room for significant improvements at shorter wavelengths, of interest for future deep UV spectroscopic missions.

Citation Download Citation

S. Quiret, B. Milliard, R. Grange, G. R. Lemaitre, A. Caillat, M. Belhadi, and A. Cotel "The FIREBall-2 UV sample grating efficiency at 200-208nm", Proc. SPIE 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray, 914432 (25 July 2014); https://doi.org/10.1117/12.2056972

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