Laser-plasma antennas, concentrators, anad directional couplers for the rf range

The application of laser plasmas to control of the directionality and focusing of radio waves is examined. The possibility of raising the rf intensity in the reception region through remote production of a hollow laser burst is studied. The signal is amplified by a factor of about three; the duration of the amplification is about 100 microseconds. The constricted propagation of radio waves in a hollow burst formed by a laser beam in a sol is considered, showing oscilloscope traces of the rf intensity. The interaction of radio waves with a laser plasma in an aerosol is studied. For a strong laser burst, signals corresponding to a pronounced cutoff and reflection are detected. As beam intensity is reduced, a significant cutoff and reflection from a finely dispersed plasma consisting of a multitude of small bright bursts is observed. The laser plasma has a long interaction time and its properties are strongly dependent on the gas pressure.