Infrared imagers play a vital role in the modern tactics of carrying out surveillance, reconnaissance, targeting and
navigation operations. The cooled systems are known to be superior to their uncooled competitors in terms of working
ranges, resolution and ability to distinguish/track fast moving objects in dynamic infrared scenes. These advantages are
primarily due to maintaining the infrared focal plane arrays at cryogenic temperatures using mechanical closed cycle
Stirling cryogenic coolers. Recent technological advances in industrial application of high-temperature (up to 200K)
infrared detectors has spurred the development of linearly driven microminiature split Stirling cryogenic coolers having
inherently longer life spans, lower vibration export and better aural stealth as compared to their rotary driven rivals.
Moreover, recent progress in designing highly efficient "moving magnet" resonant linear actuators and dedicated smart
electronics have enabled further improvements to the cooler size, weight, power consumption, cooldown time and
ownership costs. The authors report on the development and project status of a novel microminiature split Stirling linear
cryogenic cooler having a shortened to 19mm cold finger and a high driving frequency (90Hz). The cooler has been
specifically designed for cooling 130K infrared sensors of future portable infrared imagers, where compactness, low
steady-state power consumption and fast cool-down time are of primary concern.