Femtosecond laser directed fabrication of optical diffusers.
Femtosecond laser directed fabrication of optical diffusers.
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DOI：
10.1039/c7ra00109f
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发表时间：
2017-03-22
期刊：
影响因子：
3.9
通讯作者：
Butt H
中科院分区：
文献类型：
--
作者：
Alqurashi T;Penchev P;Yetisen AK;Sabouri A;Ameen RM;Dimov S;Butt H
通过基于飞秒激光的玻璃纹理生产光学扩散器。光学扩散器广泛应用于白炽灯、成像系统、显示技术、激光器和发光二极管 (LED)。在这里，演示了一种通过飞秒激光加工制造光学扩散器的方法。用飞秒激光烧蚀浮法玻璃表面，形成纳米级波纹，其尺寸与可见光波长相当。这些结构可产生高效且宽视场的漫射器。加工图案改变了平均表面粗糙度，大多数颗粒在几百纳米范围内。通过最佳加工参数实现了光学扩散特性和接近 172° 的最大扩散角。经测量，漫射器在可见光谱范围内的透射率约为 30%。所展示的技术具有生产低成本大面积光学器件的潜力。该工艺受益于激光写入方法的灵活性，并且能够生产定制光学扩散器。
Production of optical diffusers via femtosecond laser based texturing of glass. Optical diffusers are widely used in filament lamps, imaging systems, display technologies, lasers, and Light Emitting Diodes (LEDs). Here, a method for the fabrication of optical diffusers through femtosecond laser machining is demonstrated. Float glass surfaces were ablated with femtosecond laser light to form nanoscale ripples with dimensions comparable to the wavelength of visible light. These structures produce highly efficient and wide field of view diffusers. The machined patterns altered the average surface roughness, with the majority of particles in the range of a few hundred nanometers. The optical diffusion characteristic and a maximum diffusion angle of near 172° was achieved with optimum machining parameters. The transmission performance of the diffusers was measured to be ∼30% across the visible spectrum. The demonstrated technique has potential for producing low-cost large area optical devices. The process benefits from the flexibility of the laser writing method and enables the production of custom optical diffusers.
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