期刊
SENSORS
卷 21, 期 22, 页码 -出版社
MDPI
DOI: 10.3390/s21227591
关键词
antiresonant hollow core fibers; femtosecond laser micromachining; microchannel fabrication; microstructured fibers
资金
- National Science Centre (NCN) [UMO-2018/30/Q/ST3/00809]
- Polish National Agency for Academic Exchange [PPI/APM/2018/1/00031/U/001]
- National Natural Science Foundation of China [61935002, 61961136003]
- Key Research Program of Frontier Sciences, Chinese Academy of Sciences [ZDBS-LY- JSC020]
- CAS Pioneer Hundred Talents Program
- Open Fund of the Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques (South China University of Technology)
- Foundation for Polish Science within the First TEAM program
- European Union [POIR.04.04.00-00-434D/17-00]
This study demonstrated the fabrication of microchannels in a nodeless antiresonant hollow-core fiber (ARHCF) using femtosecond laser cutting, improving gas flow into the fiber core. Experimental results showed low transmission losses and the flexibility of the process. The maximum bending radius for the ARHCF with the processed microchannel was experimentally determined to be 15 cm without causing breaking.
In this work, we present femtosecond laser cutting of microchannels in a nodeless antiresonant hollow-core fiber (ARHCF). Due to its ability to guide light in an air core combined with exceptional light-guiding properties, an ARHCF with a relatively non-complex structure has a high application potential for laser-based gas detection. To improve the gas flow into the fiber core, a series of 250 x 30 mu m microchannels were reproducibly fabricated in the outer cladding of the ARHCF directly above the gap between the cladding capillaries using a femtosecond laser. The execution time of a single lateral cut for optimal process parameters was 7 min. It has been experimentally shown that the implementation of 25 microchannels introduces low transmission losses of 0.17 dB (< 0.01 dB per single microchannel). The flexibility of the process in terms of the length of the performed microchannel was experimentally demonstrated, which confirms the usefulness of the proposed method. Furthermore, the performed experiments have indicated that the maximum bending radius for the ARHCF, with the processed 100 mu m long microchannel that did not introduce its breaking, is 15 cm.
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