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光学微球腔因其回音壁模式可获得极高的品质因数而受到广泛关注.本文分析了Fabry-Perot腔和微球腔的基本原理,通过CO2激光熔融光纤实验制得了直径为1.2mm的微球腔,并测试了微球腔和锥形光纤耦合结构的耦合特性.采用典型的PDH稳频系统设计了基于微球腔的稳频系统,分析了用于鉴频的误差曲线的吸收特性和色散特性,对比了不同调制频率、微球腔直径、耦合损耗、传输损耗下与误差曲线斜率的关系.结果表明:耦合状态下最大Q值可达到1.1×108,调节微球腔内横磁模和横电模的转换可优化耦合效率,匹配微球腔和锥形光纤的尺寸得到了径向二阶模式的透射谱,误差曲线效率达到15.4A mW/MHz.球腔在提高PDH稳频技术灵敏度上具有巨大潜力.
Optical microspheres have attracted much attention due to their high quality factor in the whispering gallery.The basic principle of Fabry-Perot cavity and microcavity is analyzed in this paper.The micro-spherical diameter of 1.2mm Ball cavity and the coupling characteristics of the microsphere cavity and the tapered fiber coupling structure were tested.The frequency stabilization system based on the microsphere cavity was designed by using a typical PDH frequency stabilization system.The absorption characteristics of the error curve for frequency discrimination Dispersion characteristics were compared with the slope of the error curve under different modulation frequencies, micro-cavity diameter, coupling loss and transmission loss.The results show that the maximum Q value can reach 1.1 × 108 in the coupled state, and the transverse magnetic mode And transverse electric mode conversion can optimize the coupling efficiency, and the radial second-order transmission spectrum is obtained by matching the size of the microsphere cavity and the tapered optical fiber, the error curve efficiency reaches 15.4A mW / MHz. The spherical cavity improves the PDH frequency stabilization technology Sensitivity has great potential.