Author Affiliations
Abstract
1 Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230027, China
2 School of Instrument Science and Technology, Hefei University of Technology, Hefei 230009, China
3 School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510643, China
4 Science and Technology on Optical Radiation Laboratory, Beijing 100039, China
In this Letter, we demonstrate high-quality (Q), millimeter-size, and V-shaped calcium fluoride crystalline resonators for modal modification. To manufacture such resonators, we develop a home-made machining system and explore a detailed process. With a dedicated polished container, three special polishing steps, including grinding, smoothing, and polishing, are employed to achieve the required surface smoothness, which is characterized by less than 3 nm. An ultra-high-Q factor exceeding 108 is obtained by a coupled tapered fiber. In addition, a customized packaged structure for our disk resonator is achieved. The Q maintenance and stable spectrum are realized by sealing the coupling system in a hard disk. The simple, stable, portable, controlled, and integratable device would provide great potential in optical filters, sensors, nonlinear optics, cavity quantum electrodynamics, and especially some applications that require large resonators such as gyroscopes.
140.3410 Laser resonators 350.3950 Micro-optics 210.4590 Optical disks 220.5450 Polishing Chinese Optics Letters
2019, 17(11): 111401
中国科学技术大学精密机械与精密仪器系， 安徽 合肥 230027
利用时域有限差分(FDTD)法模拟了均匀结构、双层结构和三层结构光学微球腔，得到了各自的能量密度分布，通过对比发现多层结构具有更高的最大能量密度与存储能量和较小的模式体积。波导与多层微球腔之间存在一个最佳间隙，模拟结构的最佳间隙在60~120 nm。改变高折射层的厚度和折射率，在特定波长的入射光下可以获得具有较高最大能量密度(大于360)或者较小模式体积的(小于0.03)的微球腔，确定了优化的厚度和折射率。分析高斯光激励的带有导出波导的微球腔，导出波导与微球腔中的光具有相似的激发频谱，表明多层微球腔可以对入射光实现选频并导出。结果显示，多层微球腔具有更好的性能，为光学微球腔后续的结构设计和实际应用提供了一个新的优化思路。
微纳光学 光学微球腔 时域有限差分法 波导 多层结构
