Optimization Of The Coupling Of Excimer Laser Radiation (308 nm) Into Q-Q Fibres Ranging From 200-600 Âµm Core Diameter.

H. Kar; J. Helfmann; K. Dorschel; G. Muller; O. Muller; H. Ringelhan; B. Schaldach

doi:10.1117/12.952126

15 June 1989 Optimization Of The Coupling Of Excimer Laser Radiation (308 nm) Into Q-Q Fibres Ranging From 200-600 μm Core Diameter.

H. Kar, J. Helfmann, K. Dorschel, G. Muller, O. Muller, H. Ringelhan, B. Schaldach

Author Affiliations +

Proceedings Volume 1067, Optical Fibers in Medicine IV; (1989) https://doi.org/10.1117/12.952126
Event: OE/LASE '89, 1989, Los Angeles, CA, United States

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 (^θ_B) should about the same as the fibre aperture (^θ_F). 3. The point 1 and 2 can be fulfilled, if the beam parameter product d ^θ_B(d = waist radius) is equal or less than the parameter product of the fibre.

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H. Kar, J. Helfmann, K. Dorschel, G. Muller, O. Muller, H. Ringelhan, and B. Schaldach "Optimization Of The Coupling Of Excimer Laser Radiation (308 nm) Into Q-Q Fibres Ranging From 200-600 μm Core Diameter.", Proc. SPIE 1067, Optical Fibers in Medicine IV, (15 June 1989); https://doi.org/10.1117/12.952126

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