Baraillon Joris, Taurel Boris, Labeye Pierre, Duraffourg Laurent
Commissariat à l'Energie Atomique, LETI, Université Grenoble Alpes, 38054, Grenoble, France.
Sci Rep. 2022 Mar 23;12(1):4937. doi: 10.1038/s41598-022-08960-0.
Optomechanical systems benefit from the coupling between an optical field and mechanical vibrations. Fiber-based devices are well suited to easily exploit this interaction. We report an alternative approach of a silicon nitride membrane-in-the-middle of a high quality factor ([Formula: see text]-[Formula: see text]) Fabry-Perot, formed by a grating inscribed within a fiber core as an input mirror in front of a dielectric back mirror. The Pound-Drever-Hall technique used to stabilize the laser frequency on the optical resonance frequency allows us to reduce the low frequency noise down to [Formula: see text]. We present a detailed methodology for the characterization of the optical and optomechanical properties of this stabilized system, using various membrane geometries, with corresponding resonance frequencies in the range of several hundred of [Formula: see text]. The excellent long-term stability is illustrated by continuous measurements of the thermomechanical noise spectrum over several days, with the laser source maintained at optical resonance. This major result makes this system an ideal candidate for optomechanical sensing.
光机械系统受益于光场与机械振动之间的耦合。基于光纤的器件非常适合轻松利用这种相互作用。我们报告了一种替代方法，即在高品质因数（[公式：见文本]-[公式：见文本]）法布里-珀罗中间的氮化硅膜，它由刻写在光纤芯内的光栅作为介质后镜前的输入镜形成。用于将激光频率稳定在光学共振频率上的庞德-德雷弗-霍尔技术使我们能够将低频噪声降低到[公式：见文本]。我们提出了一种详细的方法，用于表征这种稳定系统的光学和光机械特性，使用各种膜几何形状，其相应的共振频率在几百[公式：见文本]的范围内。通过在几天内连续测量热机械噪声谱，并将激光源保持在光学共振状态，说明了出色的长期稳定性。这一主要结果使该系统成为光机械传感的理想候选者。
