Bailleul Damien, Serrano Esteban, Mahlovanyi Bohdan, Boussard-Plédel Catherine, Le Coq David, Désévédavy Frédéric, Mathey Pierre, Gadret Grégory, Strutynski Clément, Messaddeq Younès, Smektala Frédéric, Kibler Bertrand
Appl Opt. 2025 Aug 1;64(22):6249-6254. doi: 10.1364/AO.564088.
Post-processing and functionalization of optical fibers with engineered properties, as well as multifiber assembly, have been the subject of intensive studies over the past few decades, to provide, for instance, unprecedented signal processing and sensing tools for a variety of applications. However, combining distinct optical functions such as nonlinear pulse processing and linear sensing on a single fiber segment has still remained an elusive challenge in the mid-infrared spectral region. Here, we report the development of very short multi-tapered chalcogenide rods to enable the dual function of supercontinuum generation and evanescent wave sensing in the mid-infrared spectral region. On the one hand, we demonstrate the generation of an ultrabroadband light spectrum ranging from 1.9 to 16 µm with significant average power in 5 cm long tapered multimode Te-As-Se rods pumped by a femtosecond mid-infrared pump laser. On the other hand, we show that a second coiled taper can also be shaped after the broadband frequency conversion and serve as an efficient compact sensing head to collect mid-infrared signatures of alcoholic solutions. Our work represents what we believe to be a new step toward the development of compact fiber devices for mid-infrared sensing technologies.
在过去几十年里，具有工程特性的光纤后处理与功能化以及多光纤组装一直是深入研究的主题，目的是为各种应用提供前所未有的信号处理和传感工具。然而，在单光纤段上结合诸如非线性脉冲处理和线性传感等不同光学功能，在中红外光谱区域仍然是一个难以实现的挑战。在此，我们报告了极短的多锥形硫系化合物棒的研制情况，以实现中红外光谱区域的超连续谱产生和倏逝波传感的双重功能。一方面，我们展示了在由飞秒中红外泵浦激光器泵浦的5厘米长锥形多模碲 - 砷 - 硒棒中产生了范围从1.9至16微米的超宽带光谱，且具有显著的平均功率。另一方面，我们表明在宽带频率转换之后还可以形成第二个盘绕锥形，并且它可以用作高效紧凑的传感头来收集酒精溶液的中红外特征信号。我们的工作代表了我们认为在开发用于中红外传感技术的紧凑型光纤器件方面迈出的新一步。
