The existence of dark and gray spatial solitons in logarithmically nonlinear media is investigated. It is shown that both dark and gray solitons are possible in corresponding nonlinear media.

对在对数型非线性介质中空间灰孤子的存在性进行了研究，认为对数型非线性介质中可以同时支持暗和灰空间孤子态。

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The variation equation describing distance dependence of the beam waist of a fundamental Gaussian beam with high intensity propagating in logarithmically saturable nonlinear media has been deduced.

导出了在对数饱和非线性介质中传播的强激光基模高斯光束宽度随传播距离变化的方程。

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