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实验发现,飞秒激光微加工光纤微腔时,两个侧壁与纤芯轴向并不完全垂直,刻蚀的非平行壁光纤微腔Mach-Zehnder干涉仪出现光程差随波长增大而线性减小、微腔总损耗随波长增大呈递减变化等反常现象.对此,提出非平行壁光纤微腔Mach-Zehnder干涉仪新模型并初步建立了分析理论,采用新模型及分析理论对新型微腔干涉仪特性进行了研究.数值分析了微腔底角、深度等参数对谱峰波长位置的影响,理论研究了微腔的光波传输损耗、吸收损耗、插入损耗、材料红外吸收损耗以及对干涉条纹对比度的影响,理论分析与实验结果相符.实验获得水溶液干涉条纹对比度高达35 dB的非平行壁光纤微腔Mach-Zehnder干涉仪,将新型光纤微腔干涉仪用于流体传感,其蔗糖水溶液折射率传感灵敏度高达-12937.31 nm/RIU.
The experimental results show that when the femtosecond laser micromachises the optical fiber microcavity, the two sidewalls are not perpendicular to the axial direction of the fiber core. The optical path difference of the etched non-parallel-wall optical fiber microcavity Mach-Zehnder interferometer increases with wavelength Linear decrease and total loss of microcavity decrease with increasing wavelength.In this paper, a new model of non-parallel wall optical fiber microcavity Mach-Zehnder interferometer is proposed and the theory of analysis is preliminarily established, and a new model and analytical theory are proposed The characteristics of the new microcavity interferometer were studied.The effects of microcavity base angle, depth and other parameters on the position of the spectral peak were numerically analyzed, and the propagation loss, absorption loss, insertion loss, infrared absorption loss of the microcavity, On the contrast of the interference fringes, the theoretical analysis is in good agreement with the experimental results.Experiments obtained non-parallel wall optical fiber microcavity Mach-Zehnder interferometer with interference contrast of aqueous solution up to 35 dB, and used a novel optical fiber microcavity interferometer for fluid sensing, Sucrose aqueous solution refractive index sensing sensitivity up to -12937.31 nm / RIU.