Abstract

Research on thin film deposited by atomic layer deposition (ALD) for laser damage resistance is rare. In this paper, it has been used to deposit TiO2/Al2O3 films at 110°C and 280°C on fused silica and BK7 substrates. Microstructure of the thin films was investigated by x-ray diffraction. The laser-induced damage threshold (LIDT) of samples was measured by a damage test system. Damage morphology was studied under a Nomarski differential interference contrast microscope and further checked under an atomic force microscope. Multilayers deposited at different temperatures were compared. The results show that the films deposited by ALD had better uniformity and transmission; in this paper, the uniformity is better than 99% over 100mmΦ samples, and the transmission is more than 99.8% at 1064nm. Deposition temperature affects the deposition rate and the thin film microstructure and further influences the LIDT of the thin films. As to the TiO2/Al2O3 films, the LIDTs were 6.73±0.47J/cm2 and 6.5±0.46J/cm2 at 110°C on fused silica and BK7 substrates, respectively. The LIDTs at 110°C are notably better than 280°C.

© 2011 Optical Society of America

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