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Proceedings Paper

Delivery of powerful radiation in visible spectral region by special waveguides
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Paper Abstract

For delivery of powerful radiation in visible spectral region--cyclic olefin polymer-coated silver (COP/Ag) hollow glass waveguides with a length of 1 m and inner diameters of 1 mm were tested. As radiation sources--alexandrite electro- optically Q-switched laser generating tunable radiation centered at 750 nm (fundamental) or 357 nm (SHG) and two Q- switched and mode-locked Nd:YAG lasers generating wavelengths 1064 nm (fundamental) or 532 nm (SHG) were used. In every case, the output beam was coupled into the COP/Ag hollow glass waveguide. Coupling of radiation was optimized investigating several waveguide input protectors made from different materials to avoid spark generation at high radiation intensity. Transmittance/attenuation as a function of the input laser energy was measured in dependence to input radiation wavelength. The input/output time radiation characteristics and the spatial distributions of the output beams were also investigated. Transmission efficiency of the COP/Ag waveguides was found to be 80 - 95% in the spectral range from green to near infrared. In the blue region, transmittance was 66%. The measured transmission properties make COP/Ag hollow glass waveguides very promising for delivery of high-power laser pulses in medicine and also in other applications.

Paper Details

Date Published: 4 June 2001
PDF: 10 pages
Proc. SPIE 4253, Optical Fibers and Sensors for Medical Applications, (4 June 2001); doi: 10.1117/12.427909
Show Author Affiliations
Helena Jelinkova, Czech Technical Univ. (Czech Republic)
Mitsunobu Miyagi, Tohoku Univ. (Japan)
Jan Sulc, Czech Technical Univ. (Czech Republic)
Pavel Cerny, Czech Technical Univ. (Czech Republic)
Yi-Wei Shi, Tohoku Univ. (Japan)
Yuji Matsuura, Tohoku Univ. (Japan)
Goro Takada, Tohoku Univ. (Japan)

Published in SPIE Proceedings Vol. 4253:
Optical Fibers and Sensors for Medical Applications
Israel Gannot, Editor(s)

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