20 February 2009 250 um inner diameter hollow waveguide for Er:YAG laser radiation
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Abstract
Advanced application of Er:YAG laser radiation in medical treatment requires a suitable, very precise delivery of this light to a target. In some cases (urology, cardiology, or endodontic treatments), thin waveguides are needed. Therefore a preliminary investigation was conducted with 250/360 μm inner/outer diameter hollow glass waveguides. The waveguide has inner coating made from cyclic olefin polymer and silver layers. All delivery systems were simple and consisted of lens, protector, and the waveguide. The laser source was the Er:YAG system working in a free-running regime and generating radiation at 2.94 μm wavelength. For testing, output laser energy up to 100 mJ with a repetition rate of 1 Hz was chosen. The output laser spatial profile was approximately TEM00 mode, so the structure changes behind the delivery system were readily detected. The energy delivery characteristics were also checked, and the transmission reached 77%. The maximum input fluence into the waveguide was 200 mJ/cm2, and no significant damages to waveguides were observed after the measurements.
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Michal Němec, Michal Němec, Helena Jelínková, Helena Jelínková, Mitsunobu Miyagi, Mitsunobu Miyagi, Katsumasa Iwai, Katsumasa Iwai, Yuji Matsuura, Yuji Matsuura, } "250 um inner diameter hollow waveguide for Er:YAG laser radiation", Proc. SPIE 7173, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications IX, 71730H (20 February 2009); doi: 10.1117/12.808097; https://doi.org/10.1117/12.808097
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