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Discrete Phase Conjugate Technique for Precompensation of Laser Beams Transmitted through Turbulence.
DEPARTMENT OF THE AIR FORCE WASHINGTON DC
Pagination or Media Count:
A process and apparatus are disclosed for aligning a laser beam from a laser transmitter with an incoming laser beam, and driving any sensed tilt differences on an aperture and subaperture basis to zero. The apparatus uses a shared apperture component to sample the outgoing laser beam and the incoming target beam, retroreflector array to reverse the direction of the subaperture samples of the outgoing beam, a common-mode wavefront sensor to measure subaperture tilt differences between the reversed samples of the laser and the incoming target beam, and a deformable mirror to drive any sensed tilt differences to zero. A transparent beamsplitters used as the shared aperture component and an AC shearing interferometer is used as the basis for the common-mode sensing. By forcing the outgoing beam to be then conjugate of the incoming beam it is automatically precompensated for any aberrations in the transmission path. Patents
APPROVED FOR PUBLIC RELEASE