Hollow-core, lensed-taper launching coupler for Er:YAG laser light

Yuji Matsuura, Masaru Yaegashi, Mitsunobu Miyagi

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)


We developed a launching coupler for infrared hollow fibers transmitting Er:YAG laser light. The coupler consists of a short piece of tapered-hollow waveguide and a single lens at the entrance. We fabricate the tapered waveguide by stretching a Pyrex glass tube in a cylindrical furnace. By controlling the temperature and the stretching time, the shape of the taper is precisely controlled. Next a silver layer and a polymer layer are formed upon the inside of the tapered waveguide by using a liquid-phase coating method. Experiments performed using Er:YAG laser light showed the low-loss property and the high-power resistivity of the tapered waveguide. Also it was shown that the lensed-taper coupler effectively removed the influence of misalignment between the input laser beam and the hollow fiber.

Original languageEnglish
Pages (from-to)149-153
Number of pages5
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 1999 Dec 1
EventProceedings of the 1999 Infrared Optical Fibers and their Applications - Boston, MA, USA
Duration: 1999 Sep 211999 Sep 22

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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