Bérubé Jean-Philippe, Vallée Réal
Opt Lett. 2016 Jul 1;41(13):3074-7. doi: 10.1364/OL.41.003074.
We present a detailed study of waveguide inscription near the surface of bulk glass using a femtosecond laser. Three silicate glasses used extensively as hosts for photo-induced photonic devices were examined. Our results show that near-surface waveguides generally present a low-index contrast, as the pulse energy damage threshold decreases sharply at close proximity to the surface. We devised a novel method to allow the formation of optical waveguides that exhibit a high-index contrast up to the surface of any transparent material. As a proof of concept, the inscription of near-surface single-mode waveguides operating at a wavelength of 405 nm is demonstrated.
我们展示了一项使用飞秒激光对块状玻璃表面附近波导写入进行的详细研究。研究了三种广泛用作光诱导光子器件基质的硅酸盐玻璃。我们的结果表明，近表面波导通常呈现低折射率对比度，因为脉冲能量损伤阈值在靠近表面处急剧下降。我们设计了一种新颖的方法，以允许形成在任何透明材料表面都具有高折射率对比度的光波导。作为概念验证，展示了在波长405nm下工作的近表面单模波导的写入。
