Sol-gel prepared TiO2 – PMMA composite thin film for high laser induced damage threshold optical coating

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2024-11-23 DOI:10.1016/j.optmat.2024.116486

Suparna Pal , Rajiv Kamparath , V.V.V. Subrahmanyam , Neha Sharma , Y.P. Kumar , S.K. Tiwari , Sharad Karwal , P. Ram Sankar , N.S. Benerji

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Abstract

We report high-quality TiO₂ and TiO₂-PMMA composite thin films prepared by sol-gel process for application in optical coatings. The addition of PMMA to the TiO₂ sol exhibits significant improvements in the optical quality and morphology of the TiO₂ films. A comparison between TiO₂ and TiO₂-PMMA composite thin films is described with respect to various optical properties and their application in optical coatings for high-energy laser applications. The refractive index and bandgap of TiO₂ are tailored by controlling the TiO₂ sol: PMMA volume ratio. The refractive index varies in the range of 2.4 to 2.0 at 550 nm by controlling the TiO₂: PMMA composition. Incorporation of PMMA leads to reduction in absorption from 1000 ppm to 20 ppm in the composite films, which is attributed to passivation of defect states. In addition, incorporation of PMMA into the TiO₂ sol results in the filling of voids and a significant improvement in surface figure (from λ/6 to λ/10) of the composite films. These properties collectively enhance the laser induced damage threshold (LIDT) of 2.1 J/cm² for TiO₂ film to 17 J/cm² of the TiO₂-PMMA composite film. LIDT mechanisms in the films are discussed. Demonstration of antireflection coatings (AR) as well as high reflection coatings (HR) exhibiting wavelength tuning of the reflection peak using TiO₂-PMMA composite thin films, is presented. An AR coating @1200 nm with 11.5 J/cm² LIDT is reported.

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用于高激光诱导损伤阈值光学镀膜的溶胶-凝胶制备型二氧化钛-PMMA 复合薄膜

我们报告了采用溶胶-凝胶工艺制备的高质量二氧化钛和二氧化钛-PMMA 复合薄膜在光学镀膜中的应用。在二氧化钛溶胶中加入 PMMA 后，二氧化钛薄膜的光学质量和形貌都得到了显著改善。报告比较了 TiO2 和 TiO2-PMMA 复合薄膜的各种光学特性及其在高能激光应用光学涂层中的应用。通过控制 TiO2 溶胶和 PMMA 的体积比，可定制 TiO2 的折射率和带隙：PMMA 的体积比来调整 TiO2 的折射率和带隙。通过控制 TiO2 溶胶：PMMA 的体积比，在 550 纳米波长处的折射率在 2.4 到 2.0 之间变化：PMMA 组成。PMMA 的加入导致复合薄膜的吸收率从 1000 ppm 降至 20 ppm，这归因于缺陷态的钝化。此外，在二氧化钛溶胶中加入 PMMA 还能填充空隙，显著改善复合薄膜的表面形状（从 λ/6 增至 λ/10）。这些特性共同提高了 TiO2 薄膜的激光诱导损伤阈值（LIDT）（2.1 J/cm2）和 TiO2-PMMA 复合薄膜的激光诱导损伤阈值（17 J/cm2）。讨论了薄膜中的激光诱导损伤阈值机制。展示了使用 TiO2-PMMA 复合薄膜制作的抗反射涂层（AR）和高反射涂层（HR），这些涂层显示了反射峰的波长调整。报告显示，1200 纳米波长的 AR 涂层具有 11.5 J/cm2 的 LIDT。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.