Abstract by Devin Lewis
Physics and Astronomy
Thin film Al XUV mirror degradation over time measured by ellipsometry
Aluminum mirrors protected by fluoride films have often been used for reflective coatings, especially for broadband mirrors and gratings for infrared through to far-ultraviolet (FUV) applications. The coating materials themselves can be unstable, however. For example, Al will oxide when exposed to atmosphere and lithium fluoride, a common protective coating is unstable and moist air. It can absorb water out of the air . By understanding how these mirrors change while in contact with earth’s atmosphere, changes can be made to create better reflectors. We will report on mirror preparation and measurement of its degradation over time using ellipsometry.