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Journal of the Optical Society of Korea

Journal of the Optical Society of Korea


  • Vol. 12, Iss. 4 — Dec. 25, 2008
  • pp: 309–313

Comparison of Sapphire and Germanium Fibers for Erbium : Yag Lithotripsy

Ho Lee, Ji-Wook Yoon, Young-Dae Jung, Jee-Hyun Kim, Robert T. Ryan, Joel M.H. Teichman, and A.J. Welch  »View Author Affiliations

Journal of the Optical Society of Korea, Vol. 12, Issue 4, pp. 309-313 (2008)

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We studied the sapphire and germanium fibers to determine which optical fiber best transmits Erbium:YAG laser for intracorporeal lithotripsy. Human calculi were ablated with an Erbium:YAG laser in contact mode using two fibers. Optical outputs at the distal end of fibers were measured before and after laser lithotripsy. Upon the irradiation on the calculus with the 50 mJ and 100 mJ pulse energy, the output energy at the distal end of germanium fiber declined to approximately 50% of the input energy. For the sapphire fiber, the output energy at the distal end remained unchanged with 100 mJ input energy; however the output energy had dropped to 50% for 200 mJ input energy. In order to examine how the types of target tissue affect the fiber damage, the sapphire fiber was tested for the irradiation on soft tissue and water as well. No energy decline was observed during soft tissue and water irradiation. We also characterized ablation craters with both optical fibers. Both fibers produced similar craters on calculi in terms of depth and diameter. Sapphire fibers are better suited than germanium fibers for Erbium:YAG lithotripsy in terms of the fiber damage.

© 2008 Optical Society of Korea

OCIS Codes
(060.2270) Fiber optics and optical communications : Fiber characterization
(140.3500) Lasers and laser optics : Lasers, erbium
(170.0170) Medical optics and biotechnology : Medical optics and biotechnology
(170.1020) Medical optics and biotechnology : Ablation of tissue
(170.7230) Medical optics and biotechnology : Urology

Original Manuscript: October 28, 2008
Revised Manuscript: December 9, 2008
Manuscript Accepted: December 10, 2008
Published: December 31, 2008

Ho Lee, Ji-Wook Yoon, Young-Dae Jung, Jee-Hyun Kim, Robert T. Ryan, Joel M.H. Teichman, and A.J. Welch, "Comparison of Sapphire and Germanium Fibers for Erbium : Yag Lithotripsy," J. Opt. Soc. Korea 12, 309-313 (2008)

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