采用液相外延法、脉冲激光沉积法以及气相传输平衡法在Sr 2+ : α-BBO(001) 衬底上生长了质量优异的β-BBO 薄膜, 对薄膜进行了X射线衍射测试以及双晶摇摆曲线分析, 结果表明, 采用Sr 2+ :α-BBO单晶作为衬底制备的β-BBO薄膜具有高的择优取向度和低的半峰宽值. 同目前制备β-BBO薄膜所采用的其他衬底材料相比, Sr 2+ :α-BBO和β-BBO之间具有结构相似、透光范围匹配以及化学稳定性匹配的优点, 表明Sr 2+ :α-BBO单晶将是生长β-BBO薄膜的优异衬底材料.
Crystalline β-BBO thin films were successfully prepared on (001)-oriented Sr 2+ -doped α-BBO substrates by using liquid phase epitaxy, pulsed laser deposition and vapor transport equilibration techniques. The films were characterized by X-ray diffraction and X-ray rocking curve. The present results manifest that the β-BBO thin films grown on Sr 2+ -doped α-BBO substrates have larger degree of orientation f value and smaller X-ray rocking curve FWHM than the ones grown on other reported substrates. Compared with other substrates, α-BBO has the similar structure, the same UV cutoff and the same chemical properties to β-BBO. These results reveal that Sr 2+ -doped α-BBO single crystal may be a promising substrate proper to the growth of β-BBO films.
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