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Proceedings Paper

Optimization Of The Coupling Of Excimer Laser Radiation (308 nm) Into Q-Q Fibres Ranging From 200-600 µm Core Diameter.
Author(s): H. Kar; J. Helfmann; K. Dorschel; G. Muller; O. Muller; H. Ringelhan; B. Schaldach
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Paper Abstract

In this paper only the problems regarding to the input-coupling and transmission properties of the fibre are discussed. For a given Excimer laser system (Technolas MAX 10) the laser beam was prepared to transmit pulse energy densities up to 25 J/cm2 to fibres of 200 - 600 μm core diamter. Coupling of Excimer radiation into Q/Q fibres is limited by destruction of the front surface or the core of the fibre (Fig. 1). This limit is of the order of 40 - 50 J/cm2 for 308 nm and 50 nsec pulse length. To reach this limit it is necessary that the laser beam fulfills the following three demands: 1. The laser beam should have a diameter slightly less than the fibre core diameter and he should have flat intensity profile. 2. The beam divergence (θB) should about the same as the fibre aperture (θF). 3. The point 1 and 2 can be fulfilled, if the beam parameter product d θB(d = waist radius) is equal or less than the parameter product of the fibre.

Paper Details

Date Published: 15 June 1989
PDF: 10 pages
Proc. SPIE 1067, Optical Fibers in Medicine IV, (15 June 1989); doi: 10.1117/12.952126
Show Author Affiliations
H. Kar, Laser-Medizin-Zentrum GmbH (Germany)
J. Helfmann, Laser-Medizin-Zentrum GmbH (Germany)
K. Dorschel, Laser-Medizin-Zentrum GmbH (Germany)
G. Muller, Laser-Medizin-Zentrum GmbH (Germany)
O. Muller, Laser-Medizin-Zentrum GmbH (Germany)
H. Ringelhan, Laser-Medizin-Zentrum GmbH (Germany)
B. Schaldach, Laser-Medizin-Zentrum GmbH (Germany)


Published in SPIE Proceedings Vol. 1067:
Optical Fibers in Medicine IV
Abraham Katzir, Editor(s)

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