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19 October 2001 High-power stability of optical fibers for the visible wavelength region
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Proceedings Volume 4579, Optical Fiber and Planar Waveguide Technology; (2001)
Event: Asia-Pacific Optical and Wireless Communications Conference and Exhibit, 2001, Beijing, China
It is not generally known that light in the visible region can produce a time-dependent damage of optical fibers. For application in a novel laser projection system, fibers with silica core and fluorine doped cladding were fabricated by MCVD technique. The transmission behavior in the visible and ultraviolet spectral region was investigated. Modifications of the preparation process comprised the deposition and collapsing under reducing or oxidizing conditions to influence oxygen deficiencies and chlorine content, the treatment with water vapor and hydrogen, and the deposition of the core with small amounts of dopants as germanium. The complex diffusion and reaction behavior of hydrogen was studied and described by temperature- and concentration- dependent diffusion coefficients. All these modifications correlate with specific variations of the loss spectrum and with the fiber lifetime under blue light illumination at 446 nm wavelength with a mean power of 1 Watt corresponding to an intensity of about 0.6 MW/cm2. In the result, an increase of the power stability of the fiber and a prolongation of the lifetime by a factor of about 20 could be achieved by carefully tailored preform treatments.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Johannes Kirchhof, Sonja Unger, Siegmund Schroeter, Anka Schwuchow, Holger Frost, and Christhard Deter "High-power stability of optical fibers for the visible wavelength region", Proc. SPIE 4579, Optical Fiber and Planar Waveguide Technology, (19 October 2001);

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