We report a new photoconductive switch having an average output power of 44 mu W, an instantaneous bandwidth of similar to 300 GHz, an output pulse width of similar to 2.2 ps, a peak output power of approximate to 1.0 W, and an optical-toelectrical conversion efficiency of similar to 0.5% when pumped by a palm-sized mode-locked free-space laser at X =780.6 nm with an average power of 8.7 mW and an optical pulse width of similar to-230 fs. The switch is made from an ErAs:GaAs epitaxial layer inside a resonant optical cavity and coupled to a planar three-turn square spiral antenna. (c) 2006 Optical Society of America
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