| 摘要 |
An object is to obtain a laser cutting device and a laser cutting method with which a thick processing item can be cut by using laser light whose wavelength is shorter than that of CO2 laser light. With a laser cutting device (10), a laser emitting unit (24) emits a laser beam (YAG-based laser light whose wavelength is shorter than that of CO2 laser light) for cutting a processing item (30), an optical system (26) focuses the laser beam so that the laser beam has an elliptical cross-sectional shape and so that a long-axis direction of the ellipse is aligned with a direction in which cutting of the processing item (30) progresses, and thus, the elliptically-focused laser beam contributes to raising the temperature of a molten pool inside the processing item (30).
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