<title>Si:Ga focal-plane arrays for satellite and ground-based telescopes</title>

Since 1984, infrared sensors devices have been developed in the CEA-LETI laboratories for astronomical observation in the 4-17 micrometers wavelength band using Si:Ga detectors. These devices are to equip ISOCAM, a camera which will operate from ISO (Infrared Space Observatory), the European satellite expected to be launched in May 1993, and C10(mu) , a French astronomical camera which will be based at the CFHT (Canadian French Hawaii Telescope). In this paper, a brief description of the devices and their operating conditions, as well as main preliminary results, are given.