每个晶体结构由相间的二氧化硅层和高分子聚合材料层组成，相同材料层之间的间距与声子的波长相匹配。
Each crystal structure consists of alternating layers of silicon dioxide and a polymer material, so that the spacing between similar layers matches the wavelength of phonons.
另外从理论上分析了晶体温度对实验结果的影响，推导出了LBO晶体的温度匹配条件。
Besides, the crystal temperature influenced on experiment result was analyzed, and temperature matching condition of LBO was given out.
由于光纤通信系统中光功率很低，使得满足晶体的相位匹配变得更加重要。
And due to the low optical power of the optical communication system, it is more important to match the crystal phases.
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