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Proceedings Paper

Fiber-guided tunable UV-laserlight system around 215 nm
Author(s): Karl-Friedrich Klein; Stefan Huettel; H. Georg Schulze; L. Shane Greek; Michael W. Blades; Charles A. Haynes; Robin F. B. Turner
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Paper Abstract

Silica based optical fibers are in operation for light- guidance in many applications, with wavelengths ranging from 230 nm to 2.2 micrometer. At shorter wavelengths, UV- improved fibers (UVI) can be used, which overcome the significant generation of UV-defects and associated loss in throughput using broadband deuterium-lamps or UV-lasers with fixed wavelengths such as excimer-lasers and quadrupled Nd:YAG lasers. Alternatively, many spectroscopic applications need a tunable and powerful UV-light to carry out remote-measurements, in-situ. In addition, specialized fiber-optics probe may be useful. We report for the first time on the transmission properties of the UVI-fibers with high-power pulsed lasers with wavelengths in the vicinity of the dominant UV-defect at 215 nm using a frequency-doubled dye-laser, tunable from 206 to 245 nm. Due to the high intensity of this pulsed laser system, especially near the fiber frontface, two-photon absorption plays a major role with decreasing wavelength. Therefore, properties such as starting transmission and UV-induced loss were measured as a function of the wavelength and input pulse energy. The envelope of the wavelength-dependent induced losses is comparable with results taken from tests with low-power broadband deuterium-lamps. However, the temporal behavior during recovery is quite different.

Paper Details

Date Published: 18 April 1997
PDF: 11 pages
Proc. SPIE 2977, Specialty Fiber Optics for Biomedical and Industrial Applications, (18 April 1997);
Show Author Affiliations
Karl-Friedrich Klein, Fachhochschule Giessen-Friedberg (Germany)
Stefan Huettel, Fachhochschule Giessen-Friedberg (Germany)
H. Georg Schulze, Univ. of British Columbia (Canada)
L. Shane Greek, Univ. of British Columbia (Canada)
Michael W. Blades, Univ. of British Columbia (Canada)
Charles A. Haynes, Univ. of British Columbia (Canada)
Robin F. B. Turner, Univ. of British Columbia (Canada)

Published in SPIE Proceedings Vol. 2977:
Specialty Fiber Optics for Biomedical and Industrial Applications
Abraham Katzir; James A. Harrington, Editor(s)

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