Le Camus Arthur, Petit Yannick, Bérubé Jean-Philippe, Bellec Matthieu, Canioni Lionel, Vallée Réal
Opt Express. 2021 Mar 15;29(6):8531-8541. doi: 10.1364/OE.409527.
The development of coherent sources and other optical components for the mid-infrared has been hampered by the lack of sturdy materials that can withstand high power radiation or exposition to harsh environment. BGG glasses are robust materials transmitting over the 2.5-5 μm region. We report here the direct femtosecond laser fabrication of efficient directional couplers integrated in a BGG glass chip. The photonic components are characterized from 2.1 to 4.2 μm and compared to similar structures inscribed in silica glass samples. At 2.85 μm, a 99% relative cross transmission is reported in BGG glass. The experimental measurements are in good agreement with the coupled mode theory for wavelengths up to 3.5 μm.
用于中红外的相干光源和其他光学元件的发展一直受到缺乏能承受高功率辐射或暴露于恶劣环境的坚固材料的阻碍。BGG玻璃是在2.5 - 5μm区域具有良好传输性能的坚固材料。我们在此报告了集成在BGG玻璃芯片中的高效定向耦合器的直接飞秒激光制造。对这些光子元件在2.1至4.2μm范围内进行了表征，并与石英玻璃样品中写入的类似结构进行了比较。在2.85μm波长下，BGG玻璃中的相对交叉传输率达到了99%。实验测量结果与波长高达3.5μm的耦合模理论高度吻合。
