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23 September 1997 Threshold effect in laser propagation with stimulated Brillouin scattering
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In some applications of laser propagation in the atmosphere by means of athptive optical technique or nonlinear optical effect, the method of active beacon light is used, in which a probe light is transmitted to the target and the reflective light acts as beacon light. However, the large reflective light spot on the target can't meet the application of focusing laser beam. In this paper, the threshold effect of phase conjugated light on the target is demonstrated by the presence of atmospheric turbulence. We present that through one or several times of conjugation, a large beacon light spot on the target can be reduced to a beacon light point. In our laboratory, the threshold effect is verified in the cases of two sparkles and a large area light spot on the target. In the experiment, the distance between the target and the conjugation system is lOm, and area of conjugated light spot is one-fifteenth ofthat oflarge area light spot on the target.
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Xiaojun Du, Yuezhu Wang, Youlun Ju, and Zuguang Ma "Threshold effect in laser propagation with stimulated Brillouin scattering", Proc. SPIE 3125, Propagation and Imaging through the Atmosphere, (23 September 1997);

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