Abstract

It is showed the possibility of contactless excitation of transverse oscillations in quartz optical microfibers (fiber microguides) due to their diamagnetic properties. The microguides are made from standard optical fibers by chemical etching and thermal drawing in an electric discharge arc. Dependences were found of resonance frequencies and Q factors of transverse oscillation modes of microguides on the ambient air density in a wide range of values corresponding to a pressure of 5 to 10⁵ Pa. Laser excitation of transverse oscillations in microguides was implemented and possible mechanisms of this excitation are discussed. It was found that in vacuum the resonance frequencies of transverse oscillations in microguides under laser excitation conditions are noticeably higher than in the case of magnetic force excitation of oscillations. The magnetic force excitation of microguide oscillations is shown to be possible at significant distances (~1 mm) between a microguide and the source of inhomogeneous magnetic field. These findings can serve as a basis for the development of new types of optical fiber modulators controlled by magnetic field and/or laser radiation and for the design of resonant optical fiber optic sensors with sensitive elements, based on optical microfibers.

中文翻译：

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光学微纤维中横向振荡的磁力和激光激发

摘要

研究表明，由于石英光学微纤维（光纤微导）的抗磁性，可以非接触式激发横向振荡。微导由标准光纤通过化学蚀刻和放电弧热拉伸制成。发现了微导横向振荡模式的共振频率和 Q 因子对环境空气密度的依赖关系，这些值对应于 5 至 10 ⁵ Pa 的压力。实现了微导横向振荡的激光激发，并探讨了可能的机制。讨论了这种激励。研究发现，在真空中，激光激励条件下微导横向振荡的共振频率明显高于磁力激励振荡的情况。研究表明，微导振荡的磁力激励在微导和不均匀磁场源之间的显着距离（~1 毫米）处是可能的。这些发现可以作为开发由磁场和/或激光辐射控制的新型光纤调制器以及设计基于光学微纤维的具有敏感元件的谐振光纤传感器的基础。