Optical Design for the Composite InfraRed Spectrometer Lite (CIRS-Lite)

Following up on Cassini/CIRS, we are building the next-generation Composite InfraRed Spectrometer for deep-space planetary exploration. CIRS-Lite combines Mid & Far-IR channels into a single instrument with 4x the spectral sensitivity of CIRS. Here we discuss the instrument optical design, the design process, and the system performance.