Improving the spectral multiplexing efficiency of ultraviolet (UV) instruments is one of the essential technology developments for future large missions. This is particularly hard in the far UV (FUV), where high reflectivity coatings and high material transmission are difficult to achieve. We present here the concept and design of the Ultraviolet Micromirror Imaging Spectrograph (UMIS), which utilizes Analog Micromirror Arrays (AMAs) as the spectral multiplexing element. These Micro-Opto-Electro-Mechanical-Systems (MOEMS)-based mirrors can be dynamically programmed to probe multiple points of interest across a wide field of view without spectral confusion limitations. We have assembled a benchtop version of UMIS, to characterize the individual arrays and to evaluate the performance of the overall system in optical and FUV wavelengths. The instrument consists of a 75 cm off-axis telescope, with two AMAs placed on either side of the focal plane, and an optical spectrograph with a resolution of about R=1000. The individual mirror orientations can be adjusted by varying their bias voltages, which are controlled using custom electronic boards designed and fabricated by Ball Aerospace and LASP. The same testbed will be reconfigured with an FUV grating and detector, to calibrate the instrument in a vacuum environment and qualify the AMAs for future flight missions.
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