Optimization of mission enabling broadband Lyman ultraviolet series to infrared aluminum lithium fluoride reflectors

The Habitable Worlds Observatory (HWO) concept NASA flagship mission aims to extend wavelength sensitivity down to 100 nm. Adding sensitivity capabilities near the Lyman series spectra of ~100-121.6 nm allows for observations of key diagnostic lines and heavily ionized gases with slight reliance of redshift. The lithium fluoride (LiF) overcoated aluminum (Al) coating offers high spectral efficiency down to ~100 nm while preventing oxidation of the Al. We investigate the optimization of the deposition of the Al+LiF coating material composition to attain high spectral efficiency and durable broadband reflectors down to 100 nm.