Transmission Of Excimer Laser Radiation (308 nm) Through Q/Q-Fibers Ranging From 200 - 600 µm Core Diameter

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

doi:10.1117/12.961573

26 October 1989 Transmission Of Excimer Laser Radiation (308 nm) Through Q/Q-Fibers Ranging From 200 - 600 µm Core Diameter

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

Author Affiliations +

Proceedings Volume 1132, High Power Lasers and Laser Machining Technology; (1989) https://doi.org/10.1117/12.961573
Event: 1989 International Congress on Optical Science and Engineering, 1989, Paris, France

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.

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K. Dorschel, J. Helfmann, H. Kar, G. Muller, O. Muller, H. Ringelhan, and B. Schaldach "Transmission Of Excimer Laser Radiation (308 nm) Through Q/Q-Fibers Ranging From 200 - 600 µm Core Diameter", Proc. SPIE 1132, High Power Lasers and Laser Machining Technology, (26 October 1989); https://doi.org/10.1117/12.961573

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