Chinese Optics Letters, Vol. 17, Issue 11, 111401 (2019)
Fabrication and packaging for high-Q CaF2 crystalline resonators with modal modification
Mengyu Wang1, Yu Yang1, Lingjun Meng1, Xueying Jin2, Yongchao Dong3, Lei Zhang1,*, Wenbin Xu4, and Keyi Wang1,**
- 1Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230027, China
- 2School of Instrument Science and Technology, Hefei University of Technology, Hefei 230009, China
- 3School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510643, China
- 4Science 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.