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| Paper: |
Far UV filters for HWO |
| Monograph: |
11, HWO25 Proceedings Part II: Mission Framework, Technology, and Broader Contributions |
| Page: |
295 |
| Authors: |
P. López-Reyes, C. Honrado-Benítez, N. Gutiérrez-Luna, F. Valls-Vicent, A. Iglesias-Moreno, A. García-Cañas, S. Julve.Gonzalez, G. Lopez-Reyes, E. Farr, N. Kruczek, N. Nell, K. France, and J.I. Larruquert |
| DOI: |
10.26624/NVMP2632 |
| Abstract: |
Narrowband filters covering the Lyman UV (90–120 nm) and far UV (120 nm–200 nm) have been identified by NASA as a technology gap for missions such as the Habitable Worlds Observatory (HWO). Current narrowband reflective filters use two metal-fluoride multilayers, tunable in the 120–200 nm range with >90% peak reflectance and natural bandwidths of 10–20 nm. Wider bands can be achieved with aperiodic MLs, while recent work at GOLD-IO has produced extra-narrowband filters with 4–5 nm bandwidths, useful for isolating spectral lines. The 100–120 nm region, including key lines like H Lyman β and O VI, cannot be accessed with fluoride multilayers. For this, GOLD-IO developed an Al–SiC–LiF multilayer tunable in the 100–120 nm range. To raise their TRL, narrowband-coated optics spanning 100–200 nm are included in the FLUID (CUSP-CU) sounding rocket, with environmental tests underway given the humidity sensitivity of the LiF-terminated multilayers. Additional coatings for the far UV are presented, along with methods to improve their stability and to raise their TRL in laboratory conditions. |
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