CNR-IFAC, Institute of Applied Physics Nello Carrara, Via Madonna del Piano 10, 50019 Sesto Fiorentino (FI), Italy.
Opt Lett. 2012 Jul 1;37(13):2697-9. doi: 10.1364/OL.37.002697.
Whispering-gallery-mode (WGM) microresonators are used as optical transducers for sensing applications. The typical detection scheme is based on tracking the WGM resonance shift, by scanning with a tunable laser, when a change of the refractive index in the region probed by the WGM takes place. We propose a sensing approach based instead on monitoring the position of the laser line of a fiber ring laser having a WGM microsphere in its loop. We have demonstrated that the induced shift is the same for the ring laser line and for the microsphere resonance. The proposed method requires simpler, cheaper equipment and may also improve the sensor resolution because the ring laser line is much narrower than the microsphere WGM resonance.
whispering-gallery-mode（WGM）微谐振器可用作传感应用的光传感器。典型的检测方案基于当 WGM 探测区域的折射率发生变化时，通过可调谐激光扫描来跟踪 WGM 共振位移。我们提出了一种基于监测具有 WGM 微球的光纤环形激光的激光线位置的传感方法。我们已经证明，环形激光线和微球共振的感应位移是相同的。与微球 WGM 共振相比，所提出的方法需要更简单、更便宜的设备，并且还可以提高传感器的分辨率，因为环形激光线比微球 WGM 共振窄得多。
