Nanosecond pulsed laser texturing of optical diffusers
Nanosecond pulsed laser texturing of optical diffusers
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DOI：
10.1063/1.4977743
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发表时间：
2017-02-01
期刊：
影响因子：
1.6
通讯作者：
Butt, Haider
中科院分区：
文献类型：
--
作者：
Alqurashi, Tawfiq;Sabouri, Aydin;Butt, Haider
高质量光学玻璃扩散器可应用于航空航天、显示器、成像系统、医疗设备和光学传感器。快速、准确的制造技术的发展对于它们的生产来说是非常必要的。在这里，展示了一种通过纳秒脉冲激光烧蚀快速制造光学扩散器的微图案化方法（λ=1064 nm，功率=7.02、9.36和11.7 W，扫描速度=200和800 mm s(-1)）。该实验是通过对螺旋形状的玻璃表面进行点对点纹理化来进行的。激光加工参数、脉冲数量及其功率对表面特征有显着影响。漫射器的光学特性是在不同的散射角度下表征的。微观结构的特征影响平均粗糙度从0.8μm到1.97μm。玻璃扩散器以高达 20 度的角度散射光线，在整个可见光谱中测量其传输效率高达 97%。与乳色漫射玻璃相比，所生产的光学器件漫射光较少，但散射和能量损失较少。所提出的制造方法可以应用于任何其他透明材料来创建光学漫射器。预计这项工作中提出的光学扩散器将在 LED 聚光灯和成像设备的生产中得到应用。 (c) 2017 年作者。
High-quality optical glass diffusers have applications in aerospace, displays, imaging systems, medical devices, and optical sensors. The development of rapid and accurate fabrication techniques is highly desirable for their production. Here, a micropatterning method for the fast fabrication of optical diffusers by means of nanosecond pulsed laser ablation is demonstrated (lambda=1064 nm, power=7.02, 9.36 and 11.7 W and scanning speed=200 and 800 mm s(-1)). The experiments were carried out by point-to-point texturing of a glass surface in spiral shape. The laser machining parameters, the number of pulses and their power had significant effect on surface features. The optical characteristics of the diffusers were characterized at different scattering angles. The features of the microscalestructures influenced average roughness from 0.8 mu m to 1.97 mu m. The glass diffusers scattered light at angles up to 20 degrees and their transmission efficiency were measured up to similar to 97% across the visible spectrum. The produced optical devices diffuse light less but do so with less scattering and energy losses as compared to opal diffusing glass. The presented fabrication method can be applied to any other transparent material to create optical diffusers. It is anticipated that the optical diffusers presented in this work will have applications in the production of LED spotlights and imaging devices. (c) 2017 Author(s).