Adaptive Optics in the Far IR and Submillimeter Ranges
A new method for high speed temporal modulation of infrared wave beams, reflected from semiconductor thin films containing a plasma of free carriers, is proposed. The physical foundations of such a method, based on the non-linear and bistability properties of free carrier plasmas in these films, show the possibility of developing high-speed tunable modulators and polarizers. The bistability conditions are tunable by means of magnetic field. The reflection of a continuous wave beam from a film with tunable reflection coefficient leads to pulse shaping, the pulse duration being as small as 10−9 sec.
KeywordsReflection Coefficient Wave Beam Carrier Temperature Carrier Heating Complex Reflection Coefficient
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