DEVELOPMENT OF A COMPACT MULTILAYER MIRROR (MLM) POLARIMETER IN THE EXTREME ULTRAVIOLET (EUV) RANGE H. Merabet*, M. Bailey#, and R. Bruch* *Department of Physics, University of Nevada Reno, Reno NV 89557 USA #Atmospheric Science Center, Desert Research Institute (DRI), Reno NV 89506 USA A molybdenum/silicon (Mo/Si) multilayer mirror (MLM) polarimeter has been constructed, characterized and used to analyze the extreme ultraviolet (EUV) emission from excited He and He+ states following e- + He collisions for wavelengths ranging from approximately 25.6 nm to 58.4 nm. A ratio of reflectivities for s and p polarized light, Rs/Rp=10, and a resolving power of lambda/delta lambda =6 at 30.4 nm were obtained. These characteristics and the use of a VYNS1 spectral filter were sufficient to allow a detailed polarization study of the first two members of the Lyman series of He+ at wavelengths of 30.4 and 25.6 nm.