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An experimental study of real-time adaptive compensation through a high-gain Raman amplifier is discussed. Atmospheric turbulence was simulated by selectively aberrated quartz plates designed to produce a turbulence-like phasefront distortion on a transmitted beacon. A 69-channel wavefront sensor measured the beacon's phasefront and commanded a deformable mirror to impose the conjugate phasefront on the Stokes seed to a high-gain, large-Fresnel-number Raman amplifier. After amplification, the output Stokes beam was made to retrace the path of the beacon back through the simulated turbulence. Measurements of the Stokes beam quality indicate a dramatic improvement to near-diffraction-limited performance. The experimental results are in good agreement with theory.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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Higgs et al. (1990) studied this question.
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