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Proceedings Paper

Pulsed kilowatt Nd:YAG laser with fiber optic beam delivery
Author(s): Peter Verboven
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Paper Abstract

An Nd:YAG laser with 1 kW average power, 180 J pulse energy, 60 kW pulse power and with 600 micrometers diameter fiber optic beam delivery has been developed. Applications include 4.8 mm deep seam welding at 50 mm/min and 5 mm thick metal cutting at 400 mm/min. Using pulse superposition of unequal and or delayed pulses provides a simple and effective way of shaping the time profile of the pulse, which can be of advantage for special welding applications. Energy is measured on line by means of a wedged beam sampler, an integrating sphere, an optical fiber and a photodiode. Regarding the beam delivery optics, special care must be taken to minimize reflection losses. Anti-reflection coating of fiber end faces was investigated. Though the peak power density 30 MW/cm2 is lower than what has been reported as a routinely achievable damage threshold, the tremendous energy density 90 kJ/cm2 poses problems. In view of the relatively small area of the fiber, end face cleaning and surface adhesion are critical. Two high power processing head objectives were developed to image the fiber end face onto the work piece.

Paper Details

Date Published: 16 August 1994
PDF: 10 pages
Proc. SPIE 2206, High-Power Gas and Solid State Lasers, (16 August 1994); doi: 10.1117/12.184606
Show Author Affiliations
Peter Verboven, Lasag and A.G. Industrial Lasers (Switzerland)

Published in SPIE Proceedings Vol. 2206:
High-Power Gas and Solid State Lasers
Markus Bohrer; Tommaso Letardi; Dieter Schuoecker; Horst Weber, Editor(s)

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