Stressed Ge:Ga Detector Arrays for PACS and FIFI LS

Gallium doped germanium detector arrays in a 16x25 pixel configuration will be used on two future instruments: In the spectrometer section of the Photodetector Array Camera and Spectrometer (PACS) aboard the Herschel satellite and the Field Imaging Far Infrared Line Spectrometer (FIFI LS) aboard the Stratospheric Observatory for Infrared Astronomy (SOFIA). Arrays of slightly stressed Ge:Ga detectors cover a wavelength range from 55 to 105 micron for PACS and from 40 to 120 micron for FIFI LS, whereas arrays of highly stressed Ge:Ga detectors cover a wavelength range from 105 to 210 micron for PACS and 120 to 210 micron for FIFI LS. The entire arrays consist of 25 independent modules of 16 pixels. The detector arrays will be operated with multiplexed integrating amplifiers with cryogenic readout electronics located close to the detector modules. The design of the detector arrays and results of first performance measurements will be reported.