We describe the IR focal plane filters of the MAJIS imaging spectrometer for the JUICE mission to the Jupiter System. The focal plane filters provided by Viavi Solutions are integrated into a filter holder placed above the IR channel focal plane array, enclosed in a baffle and cooled to cryogenic temperatures. The filters comprise two segments bonded together on a sapphire substrate: a broad-band, low-pass filter and a narrow-band linear variable filter (LVF) in the MWIR. We present the justification for using such filters, their architecture, the measurement facilities that were implemented for assessing their performances and the derived optical performances. The filters have been fully qualified and integrated into MAJIS and are within the performance specifications.
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