Femtosecond laser enabled selective micro-holes drilling on the multicore-fiber facet for displacement sensor application.
Femtosecond laser enabled selective micro-holes drilling on the multicore-fiber facet for displacement sensor application.
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DOI：
10.1364/oe.27.010777
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发表时间：
2019-04
期刊：
影响因子：
3.8
通讯作者：
Cong Zhang;Zhisheng Jiang;S. Fu;M. Tang;W. Tong;Deming Liu
中科院分区：
文献类型：
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作者：
Cong Zhang;Zhisheng Jiang;S. Fu;M. Tang;W. Tong;Deming Liu
我们实验演示了飞秒激光实现多芯光纤端面上的选择性微孔钻削技术。通过图像处理算法初步锁定了单纤芯在七纤芯光纤端面的精确位置，优化飞秒激光脉冲能量后成功加工出六个微孔。同时，对所制备的七芯光纤在反射式强度调制光纤位移传感器（RIM-FODS）中的应用进行了全面的研究。利用光束传播法（BPM），从理论上研究了微孔深度对RIM-FODS性能的影响，包括死区和测量范围。我们发现，随着微孔深度的增加，死区范围可以大大减少的测量范围减少的代价。然而，具有连续深度差的多个微孔可以克服这样的问题。在七芯光纤端面加工5、10、15、20、25、30 μm深度的微孔后，测量盲区范围从150 μm减小到20 μm，测量范围从250 μm扩展到400 μm。
We experimentally demonstrate a femtosecond laser enabled selective micro-holes drilling technique on the multicore-fiber facet. The precise position of individual cores at the seven-core fiber facet is initially locked by the image processing algorithm, and then six micro-holes are successfully fabricated after the pulse energy of femtosecond laser is optimized. Meanwhile, the use of fabricated seven-core fiber for the application of reflective intensity-modulated fiber optics displacement sensor (RIM-FODS) is comprehensively investigated. By using the beam propagation method (BPM), we theoretically investigate the effect of micro-hole depth on the RIM-FODS performance, in terms of both dead zone and measurement range. We identify that, with the increase of micro-hole depth, the dead zone range can be substantially reduced at the expense of measurement range reduction. However, multiple micro-holes with a successive depth difference can overcome such problem. When the micro-holes with depths of 5, 10, 15, 20, 25, 30 μm are fabricated on the seven-core fiber facet, and the dead zone range can be substantially reduced from 150 μm to 20 μm, together with an extension of measurement range from 250 μm to 400 μm.