Efficient Dynamic Phasefront Modulation System for Free-Space Optical Communications.
Patent, Filed 9 Sep 88, patented 22 Jan 91,
DEPARTMENT OF THE NAVY WASHINGTON DC
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An optical communications system is disclosed for correcting in real-time the wavefront distortions of a beam from a coherent optical transmitting source. The system includes a collimating lens and beam splitter for receiving a distorted wavefront signal beam and splitting the beam into a pump beam and a weaker intensity signal beam. The system includes a detector and computer for measuring the beam distortion and specifying a compensatory wavefront. The weaker intensity signal beam is modified in a 2-D spatial light modulator according to a compensatory wavefront. A photo-refractive material is used to couple energy from the pump beam to the compensated wavefront signal beam thereby producing a corrected and intensity-enhanced communications beam.
- Command, Control and Communications Systems