4.6 Article

Fabrication of Lensed Optical Fibers for Biosensing Probes Using CO2 and Femtosecond Lasers

Journal

APPLIED SCIENCES-BASEL
Volume 11, Issue 9, Pages -

Publisher

MDPI
DOI: 10.3390/app11093738

Keywords

CO2 laser; femtosecond laser; lensed fiber; fiber cleaving

Funding

  1. Chosun University
  2. Ministry of Education, Science & Technology (MoST), Republic of Korea [gist-20] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
  3. Ministry of Science, ICT & Future Planning, Republic of Korea [GIST-20] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
  4. Ministry of Science & ICT (MSIT), Republic of Korea [GIST-04, GIST] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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A new method for fabricating a lensed fiber with a desired focal length using femtosecond and CO2 lasers is proposed, achieving greater precision and efficiency compared to conventional methods.
We propose a new method for precisely fabricating a lensed fiber with a desired focal length by first cleaving a coreless silica fiber using an ultrafast femtosecond laser without thermal effects and subsequently shaping the radius of curvature at the optical-fiber end using a CO2 laser. The precisely cleaved segment of the coreless silica fiber obtained with the femtosecond laser is attached to a long single-mode fiber. The beam-exposure time and laser power of the CO2 laser are adjusted to melt the coreless-fiber end to yield a uniform, consistent, and precise radius of curvature, thereby realizing a lensed optical fiber. The precision of the radius of curvature in this case is greater than those obtained with the conventional arc discharge method with thermal treatment requiring fairly complex processes and yielding relatively low fabrication accuracy. In our study, we observe a difference between the measured and calculated focal lengths of the fabricated lens, possibly because the exact value of the mode field diameter is uncertain. On the other hand, the beam size measured using the knife-edge method matches closely with the theoretical size. Our findings confirm the feasibility of fabricating lensed optical fibers for fiber-based biosensing using CO2 and femtosecond lasers.

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