Delivery of powerful radiation in visible spectral region by special waveguides

Helena Jelinkova; Mitsunobu Miyagi; Jan Sulc; Pavel Cerny; Yi-Wei Shi; Yuji Matsuura; Goro Takada

doi:10.1117/12.427909

4 June 2001 Delivery of powerful radiation in visible spectral region by special waveguides

Helena Jelinkova, Mitsunobu Miyagi, Jan Sulc, Pavel Cerny, Yi-Wei Shi, Yuji Matsuura, Goro Takada

Proceedings Volume 4253, Optical Fibers and Sensors for Medical Applications; (2001) https://doi.org/10.1117/12.427909
Event: BiOS 2001 The International Symposium on Biomedical Optics, 2001, San Jose, CA, United States

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.

Citation Download Citation

Helena Jelinkova, Mitsunobu Miyagi, Jan Sulc, Pavel Cerny, Yi-Wei Shi, Yuji Matsuura, and Goro Takada "Delivery of powerful radiation in visible spectral region by special waveguides", Proc. SPIE 4253, Optical Fibers and Sensors for Medical Applications, (4 June 2001); https://doi.org/10.1117/12.427909

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