Laser cutting apparatus with a high quality laser beam

Details Laser cutting apparatus with a high quality laser beam Laser cutting apparatus with a high quality laser beam

2008-03-25

2008-03-25

Evans, Geoffrey S. (Department: 1793)

Electric heating

Metal heating

By arc

C219S121670

Reexamination Certificate

active

07348517

ABSTRACT:
A laser cutting apparatus capable of properly cutting a workpiece having a large thickness with a laser beam. The laser cutting apparatus includes a gas laser oscillator; and an optical system including a collective lens and transmitting and collecting a laser beam generated in the gas laser oscillator to irradiate a workpiece with the laser beam. An index M2for evaluating a beam quality of the laser beam emerging from the optical system, with which the workpiece is irradiated, is in a range of 2.8 to 4.5; while the index M2is defined by a formula: M2=π×(dm)2/(4×λ×Zr); in which λ is a wavelength of the laser beam; dm is a minimum beam diameter of the laser beam in a predetermined optical-path range including a focal point of the collective lens; and Zr is a distance between a first position on an optical axis, at which the minimum beam diameter dm is established, and a second position on the optical axis, at which a beam diameter “21/2×dm” is established, in the laser beam in the predetermined optical-path range.

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