伴随自聚焦的受激布里渊散射相位共轭研究

OPTICAL PHASE CONJUGATION BY STIMULATED BRILLOU-IN SCATTERING IN THE PRESENCE OF SELF-FOCUSING

在聚焦激发方式下,当不均匀泵浦光场包含一个还发生自聚焦的强分量时,受激布里渊散射仍能产生高质量的共轭波。散射波这时完全发自自聚焦所形成的亮丝区域。共轭比η依赖于强分量和总入射光的强度之比σ,并在0<σ<1间区某处形成一极大值η_(max)(=80％)。借助“光纤”集光的细丝模型计算了自聚焦对η(σ)的影响,得到同实验圆满一致的结果。

Phase conjugation with high quality can be obtained by stimulated Brillouin scattering in the focused beams' scheme, even when the in homogeneous pump light contains a self-focusing strong component. The scattered light originates from the selftrapped filament regions. The conjugation fraction η depends on the intensi ty ratio a of the strong component and the total incident light, attaining a maximum η_(max) (=80%) at a certain value of σ. By taking in-tc account the effect of self-focusing on η(σ), a fair agreement with experiments is obtained.