Rugged hollow fiber for the infrared and its use in laser lithotripsy

Katsumasa Iwai, Yi Wei Shi, Yuji Matsuura, Mitsunobu Miyagi

Research output: Contribution to journalConference articlepeer-review

9 Citations (Scopus)


A rugged hollow glass fiber is fabricated by all-liquid phase technique. A silica glass capillary is used as the substrate and a polymer film is firstly coated on the inside of the capillary to protect the glass tube from moisture. This protective coating keeps the thin-wall glass tube away from damage due to the following silver plating process. On the protective coating, a silver film is deposited by a conventional mirror plating technique. Subsequently, a polymer film is coated again on the silver film to reduce transmission loss by employing interference effect of the polymer film. The hollow fiber fabricated by the above process was tested for use in lithotripsy with Er:YAG laser light of 2.94 μm-wavelength. In the test, the fiber is sealed with a silica glass cap and calculi in salt water were radiated by laser light with the pulse energy of 200 mJ. The calculi were broken after laser radiation of 30 minutes when the repetition rate was 10 Hz.

Original languageEnglish
Pages (from-to)115-119
Number of pages5
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2002
Eventoptics in Health Care and Biomedical Optics: Diagnostics and Treatment - Shanghai, China
Duration: 2002 Oct 152002 Oct 18


  • Er:YAG laser
  • Hollow fiber
  • Lithotripsy


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