Side-firing sealing caps for hollow optical fibers

Tomonori Watanabe, Yuji Matsuura

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Background and Objectives: Hollow optical fibers are useful for delivery of high-energy infrared laser beam such as Er:YAG lasers. We propose side-firing optics for hollow optical fibers for laser endoscopic applications mainly in oto-rhino-laryngology and urology. Study Design/Materials and Methods: To produce a circular beam, cone-shaped caps are designed and caps with slanted end are proposed for producing a spot beam in side direction. Both types of caps are fabricated by fusing and polished Pyrex and silica glass tubes. Results: For the both of the cone-shaped and slanted-end caps effectively deflect laser beam as designed and these caps show high durability for Er:YAG laser light with pulse energy higher than 100 mJ. Conclusions: By choosing the proper shape of the cap ends, these caps deflect an input laser beam to a preferred direction at low insertion losses. By using these side-firing optics, one can easily irradiate the inside of tubular organs.

Original languageEnglish
Pages (from-to)792-797
Number of pages6
JournalLasers in Surgery and Medicine
Issue number8
Publication statusPublished - 2006 Sept 1


  • Endoscopes
  • Er:YAG laser
  • Infrared fibers
  • Infrared lasers
  • Oto-rhino-laryngology
  • Urology

ASJC Scopus subject areas

  • Surgery
  • Dermatology


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