• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Laser-based micro- and nanoprocessing VIII >Surface transmission enhancement of ZnS via continuous-wave laser microstructuring
【24h】

Surface transmission enhancement of ZnS via continuous-wave laser microstructuring

机译：通过连续波激光微结构增强ZnS的表面传输

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Fresnel reflectivity at dielectric boundaries between optical components, lenses, and windows is a major issue for the optics community. The most common method to reduce the index mismatch and subsequent surface reflection is to apply a thin film or films of intermediate indices to the optical materials. More recently, surface texturing or roughening has been shown to approximate a stepwise refractive index thin-film structure, with a gradient index of refraction transition from the bulk material to the surrounding medium. Short-pulse laser ablation is a recently-utilized method to produce such random anti-reflective structured surfaces (rARSS). Typically, high-energy femtosecond pulsed lasers are focused on the surface of the desired optical material to produce periodic or quasi-periodic assemblies of nanostructures which provide reduced surface reflection. This technique is being explored to generate a variety of structures across multiple optical materials. However, femtosecond laser systems are relatively expensive and more difficult to maintain. We present here a low power and low-cost alternative to femtosecond laser ablation, demonstrating random antireflective structures on the surface of Cleartran ZnS windows produced with a continuous-wave laser. In particular, we find that irradiation with a low-powered (＜10 mW), defocused, CW 325nm-wavelength laser produces a random surface with significant roughness on ZnS substrates. The transmission through the structured ZnS windows is shown to increase by up to 9% across a broad wavelength range from the visible to the near-infrared.
机译：光学组件，透镜和窗户之间的介电边界处的菲涅耳反射率是光学界的主要问题。减少折射率失配和随后的表面反射的最常见方法是在光学材料上施加一层或多层中间折射率的薄膜。最近，已经显示表面纹理化或粗糙化近似于逐步折射率的薄膜结构，其中梯度折射率从大块材料过渡到周围介质。短脉冲激光烧蚀是近来使用的产生这种随机抗反射结构表面（rARSS）的方法。通常，高能飞秒脉冲激光聚焦在所需光学材料的表面上，以产生周期性或准周期性的纳米结构，从而减少表面反射。人们正在探索该技术以在多种光学材料上生成各种结构。但是，飞秒激光系统相对昂贵，并且维护难度更大。我们在此介绍飞秒激光烧蚀的一种低功耗和低成本替代品，展示了用连续波激光产生的Cleartran ZnS窗口表面上的随机抗反射结构。尤其是，我们发现用低功率（＜10 mW），散焦，CW 325nm波长的激光辐照会在ZnS衬底上产生具有明显粗糙度的随机表面。从可见光到近红外的宽波长范围内，通过结构化ZnS窗口的透射率显示最多可增加9％。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号