15 May 2012 Transfer capability of 3-5 μm radiation by hollow glass waveguide
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The aim of this work was the delivery investigation of 3 - 5 μm laser radiation by a hollow glass waveguide. The waveguide was formed by a supporting fused silica glass capillary tube with a silver layer deposited on the inside wall. As an inner dielectric material film, a cyclic olefin polymer (COP) was used. The primary parameters of the sample investigated were the inner/outer diameter 700/850 μm and the length of up to 110 cm. As radiation sources, three lasers generating in mid-infrared spectral region were designed and constructed. The flash-lamp-pumped Er:YAG laser operated at 2.94 μm wavelength. The second system was 4.3 μm Dy:PbGa2S4 laser. Its coherent pumping was performed by the flashlamp pumped Er:YLF laser generating at 1.73 μm wavelength. The third laser emitting at 4.45 μm was based on Fe:ZnSe active medium pumped by electro-optically Q-switched Er:YAG laser radiation (2.94 μm). The study presented describes a transfer capability of 3 - 5 μm radiation by COP/Ag hollow glass waveguide. The delivery efficiency and spatial structure were investigated. The transmission measured reached 84 %, 58 %, and 64 % for Er:YAG (2.94 μm), Dy:PbGa2S4 (4.3 μm), and Fe:ZnSe (4.45 μm) laser systems, respectively. The spatial beam structure transferred was similar for all systems. The laser delivery system based on COP/Ag hollow glass waveguide can be useful for some mid-infrared radiation applications.
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Michal Nemec, Michal Nemec, Helena Jelínková, Helena Jelínková, Mitsunobu Miyagi, Mitsunobu Miyagi, Hiroyuki Takaku, Hiroyuki Takaku, Katsumasa Iwai, Katsumasa Iwai, Yuji Matsuura, Yuji Matsuura, Maxim Doroshenko, Maxim Doroshenko, } "Transfer capability of 3-5 μm radiation by hollow glass waveguide", Proc. SPIE 8433, Laser Sources and Applications, 84331H (15 May 2012); doi: 10.1117/12.921525; https://doi.org/10.1117/12.921525

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