Optical characteristics of TiO2/Al2O3thin films and their atomic layer depositions
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摘要:采用原子层沉积技术在熔石英和BK7玻璃基片上镀制了TiO2/Al2O3薄膜,沉积温度分别为110 ℃和280 ℃。利用X射线粉末衍射仪对膜层微观结构进行了分析研究,并在 损伤平台上进行了抗 损伤阈值测量。采用Nomarski微分干涉差显微镜和原子力显微镜对 损伤后的形貌进行了观察分析。结果表明,采用原子层沉积技术镀制的TiO2/Al2O3增透膜的厚度均匀性较好,50 mm样品的膜层厚度均匀性优于99%;光谱增透效果显著,在1 064 nm处的透过率>99.8%;在熔石英和BK7基片上,TiO2/Al2O3薄膜在110 ℃时的 损伤阈值分别为(6.730.47) J/cm2和(6.50.46) J/cm2,明显高于在280 ℃时的损伤阈值。Abstract:Atomic Layer Deposition(ALD) was used to deposit TiO2/Al2O3 films at 110 ℃ and 280 ℃ on quartz and BK7 substrates in this paper. The microstructures of thin films were investigated by an X-ray duffractineter, and the Laser Induced Damage Threshold(LIDT) of samples was measured on a measuring table by a damage test system. Then, the damaged morphologies of the samples were investigated by an Atomic Force Microscope(AFM) and a Nomarski optical microscope, respectively. The results indicate that the films deposited by ALD show better uniformity and transmission, and its uniformity is better than 99% for a Ф50 mm sample and transmission is more than 99.8% at 1 064 nm. Furthermore, the LIDTs of the TiO2/Al2O3 films are (6.730.47) J/cm2 and (6.50.46) J/cm2 at 110 ℃ on quartz and BK7 substrates, respectively, which is notably better than that at 280 ℃.
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