Britzger Michael, Friedrich Daniel, Kroker Stefanie, Brückner Frank, Burmeister Oliver, Kley Ernst-Bernhard, Tünnermann Andreas, Danzmann Karsten, Schnabel Roman
Albert-Einstein-Institut, Max-Planck-Institut für Gravitationsphysik and Leibniz Universität Hannover, Callinstr 38, 30167 Hannover, Germany.
Opt Express. 2011 Aug 1;19(16):14964-75. doi: 10.1364/OE.19.014964.
We demonstrate the optical coupling of two cavities without light transmission through a substrate. As the all-reflective coupling component, we use a dielectric low-efficiency 3-port diffraction grating. In contrast to a conventional transmissive coupling component, such an all-reflective coupler avoids all thermal effects that are associated with light absorption in the substrate. An all-reflective scheme for cavity coupling is of interest in the field of gravitational wave detection. In such detectors light that is resonantly enhanced inside the so-called power-recycling cavity is coupled to (kilometre-scale) Fabry-Perot resonators representing the arms of a Michelson interferometer. We realized such an all-reflective coupling in a table-top experiment. Our findings are in qualitative agreement with the theoretical model incorporating the characteristics of the 3-port grating used, and therefore encourage the application of all-reflective cavity couplers in future gravitational wave detectors.
我们展示了两个腔之间的光学耦合，且光无需透过衬底传输。作为全反射耦合组件，我们使用了一个低效率的介质三端口衍射光栅。与传统的透射耦合组件不同，这种全反射耦合器避免了所有与衬底中光吸收相关的热效应。腔耦合的全反射方案在引力波探测领域具有重要意义。在这类探测器中，在所谓的功率回收腔内共振增强的光被耦合到代表迈克尔逊干涉仪臂的（千米级）法布里 - 珀罗谐振器中。我们在桌面实验中实现了这种全反射耦合。我们的发现与纳入所用三端口光栅特性的理论模型在定性上是一致的，因此鼓励在未来的引力波探测器中应用全反射腔耦合器。
