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中文摘要：
研究了介质所含杂质悬浮颗粒的大小和介质本身化学结构特性对光学击穿阈值的影响．实验结果表明，随着介质所含杂质悬浮颗粒的变小，其光学击穿阈值先是缓慢增大之后（颗粒直径小于0．22μm）迅速增大．通过净化介质可提高光学击穿阈值，进而提高相位共轭保真度、能量反射率及其稳定度等SBS特性．分子中外层原子对内部化学键的保护作用越好，外层原子的电离能越高，价电子数目越少，介质光学击穿阈值就越高．
英文摘要：
The influences of the size of suspended particles in the medium and chemical structural characteristics of the medium on the threshold of the optical breakdown are researched experimentally. The experimental results show that the optical breakdown threshold first rises slowly in accord with the size of suspended particles in the medium, while later it rises sharply （when the diameters of the particles are less than 0.22μm）. By purifying the medium, the optical breakdown threshold can be increased; thus the phase-conjugation fidelity, the reflectivity of the energy and the stability of SBS increase correspondingly. Generally speaking, better protection to the inner chemical bond offered by the outer atoms, and less valence electron together with higher ionization energies of the outer atoms will lead to higher optical breakdown threshold of the media.
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