Optical alignment results of the FLUID F110M Telescope

The Far- and Lyman-Ultraviolet Imaging Demonstrator (FLUID) is a rocket-borne multi-band arcsecond-level ultraviolet (UV) imaging instrument covering four bands between 92 -- 193 nm. FLUID will observe nearby galaxies to find and characterize the most massive stars, the primary drivers of the chemical and dynamical evolution of galaxies, and the co-evolution of the surrounding galactic environment. The first telescope to be fabricated and aligned is the short wavelength channel, F110M, covering 92 -- 115 nm. Each FLUID telescope is a Cassegrain in which each optic is coated with a reflective bandpass filter. The imaging requirement for each telescope is to resolve objects with an angular scale of 4.2'' which corresponds to a physical scale of ~100 parsecs for proposed FLUID targets, low z galaxies. We present the optical alignment method and characterization resulting in a 2.2" full width at half maximum point spread function, meeting the FLUID imaging requirement with substantial margin.