低语长廊波浪
双折射
谐振器
光学
折射率
氟化镁
材料科学
Q系数
灵敏度(控制系统)
光电子学
物理
镁
电子工程
冶金
工程类
作者
Florian Sedlmeir,Richard Zeltner,Gerd Leuchs,Harald G. L. Schwefel
出处
期刊:Optics Express
[The Optical Society]
日期:2014-12-04
卷期号:22 (25): 30934-30934
被引量:88
摘要
We present our experiments on refractometric sensing with ultrahigh-Q, crystalline, birefringent magnesium fluoride (MgF$_2$) whispering gallery mode resonators. The difference to fused silica which is most commonly used for sensing experiments is the small refractive index of MgF$_2$ which is very close to that of water. Compared to fused silica this leads to more than 50% longer evanescent fields and a 4.25 times larger sensitivity. Moreover the birefringence amplifies the sensitivity difference between TM and TE type modes which will enhance sensing experiments based on difference frequency measurements. We estimate the performance of our resonators and compare them with fused silica theoretically and present experimental data showing the interferometrically measured evanescent decay and the sensitivity of mm-sized MgF$_2$ whispering gallery mode resonators immersed in water. They show reasonable agreement with the developed theory. Furthermore, we observe stable Q factors in water well above $1 \times 10^8$.
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