Abstract by Kylie Wolfe
Physics and Astronomy
Implementing Theta-2-Theta Measurements to Measure Mirror Reflectance
Our group studies the properties of multi-layer mirrors under extreme ultraviolet light in order to inform the production of similar mirrors for future space-based telescopes. One of the mirror properties we are most interested in is reflectance as a function of angle. In the past we have had to do reflectance scans manually, one angle at a time. This semester I have implemented an automatic theta-2-theta scan which can scan the mirror and calculate its reflectance for us. In order to give accurate measurements, the computer-controlled scan accounts for limitations in our system, including a plasma source that varies in intensity over time, noise in the reflectance signal, and drift of the location of the reflected beam.