Delivery of high energy radiation in mid-infrared spectral region by hollow waveguides

Michal Němec, Helena Jelínková, Jan Šulc, Pavel Černý, Mitsunobu Miyagi, Katsumasa Iwai, Yukio Abe, Yi Wei Shi, Yuji Matsuura

Research output: Contribution to journalConference articlepeer-review

10 Citations (Scopus)


Due to increasing requirements to apply high energy mid-infrared radiation in various branches of medicine (cardiology, dentistry, dermatology, urology, gastroenterology), a sufficiently flexible and lossless delivery system is required. To transport these high energy pulses in a mid-infrared region, special cyclic olefin polymer-coated silver (COP/Ag) hollow glass waveguides were prepared and tested. The length of the waveguides was 0.5 m and inner diameter 1 mm. As a radiation source, an Er:YAG laser was used. The system generated energy up to 2.16 J or 2.35 J (depending on the repetition rate used - 3 Hz or 4 Hz, respectively). The length of transmitted pulses was measured to be 110 μs to 550 μs, depending on the pumping level. The output radiation was coupled into the COP/Ag hollow glass waveguide and the throughput and losses values were measured against the input radiation parameters. The transmission obtained was 91%. The maximum peak power up to 3 kW and mean power up to 5 W were delivered without any breakdown. The characteristics obtained make this specially constructed COP/Ag hollow glass waveguide a very promising device for the delivery of high-energy laser pulses in medicine and also in other applications.

Original languageEnglish
Pages (from-to)178-182
Number of pages5
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2003
EventPROGRESS IN BIOMEDICAL OPTICS AND IMAGING: Optical Fibers and Sensors for Medical Applications III - San Jose, CA, United States
Duration: 2003 Jan 252003 Jan 28


  • Cyclic olefin polymer-coated silver hollow glass waveguide
  • Er:YAG laser
  • High energy delivery
  • Waveguide transmittance


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