通过CO2激光器熔融不同直径的熔锥光纤以得到相应直径的石英玻璃微球, 利用此微球和熔锥光纤, 构造了球微腔耦合系统。实验中利用光腰直径为3.1 μm的熔锥光纤与直径为143.1 μm的石英玻璃微球进行耦合, 通过最大分辨力为1 pm的可调谐半导体激光器对该耦合系统进行光谱扫描, 发现石英玻璃微球的吸收光谱中出现分立的结构共振峰。利用光学微球腔理论讨论了石英玻璃微球吸收光谱中的结构共振, 并用米氏散射理论公式对一阶TE模共振峰的位置以及它们的间隔进行了计算, 共振峰位置实验结果与理论结果的误差仅为0.03％, 表明实验与计算结果相符。

The quartz microspheres with different diameters are fabricated by melting the taper fibers with corresponding diameters using CO2 laser. The spherical microcavity coupling system is constructed with taper fiber and the quartz microsphere. In the experiment, a coupling system is made of fiber taper with the diameter of 3.1 μm and a quartz microsphere with 143.1 μm diameter. The spectrum of this system is scanned using the tunable diode laser with the resolution of 1 pm, and the discrete structural resonance in the absorption spectra of the quartz microsphere is observed. According to the spherical microcavity theory, the above structural resonance is analyzed, and the Mie scattering theory is used to calculate the position of the first order TE modes and their spacing distance. The calculated result is in accordance with the observed resonance, with an error of only 0.03%.