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Theoretical aspects of the process efficiency in laser beam cutting with fibre lasers

: Mahrle, A.; Bartels, F.; Beyer, E.

Lu, Y. ; Laser Institute of America -LIA-:
ICALEO 2008, 27th International Congress on Applications of Lasers & Electro Optics. Congress proceedings. CD-ROM : October 20-23, 2008, Temecula, CA, USA
Orlando, Fla.: LIA, 2008 (LIA 611=101)
ISBN: 978-0-912035-12-3
Paper 2006, S.703-712
International Congress on Applications of Lasers & Electro Optics (ICALEO) <27, 2008, Temecula/Calif.>
Fraunhofer IWS ()
Faserlaser; Laserstrahlschneiden; Laserstrahl; Blech; Absorptionsgrad; Einfallswinkel; Prozesswirkungsgrad; Festkörperlaser; Schnittgüte; Strahlqualität

Fiber lasers offer distinct advantages over established laser technology with respect to power efficiency, beam guidance and beam quality. Consequently, the potential of these new laser beam sources will be increasingly exploited for laser cutting applications that are conventionally carried out with CO 2 lasers. However, theoretical estimates of the effective absorptivity at the cut front suggest that the shorter wavelength of the fiber laser in combination with its high focusability seems to be advantageous for thin sheet metal cutting only whereas the CO2 laser is still capable of cutting thicker materials more efficiently. This surprising result is a consequence of the absorptivity behavior of metals that shows essential quantitative differences for the corresponding wavelengths of both laser sources as a function of the angle of incidence between the laser beam and the material to be irradiated. In evaluation of the revealed dependencies, solution strategies were proposed and experimentally verified that could be useful to increase the efficiency of fiber laser cutting processes of thicker metal sheets.