LASER MEDIUM AND LASER PROCESSING DEVICE

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PROBLEM TO BE SOLVED : To solve the problem that uniform energy distribution is obtained only in a specified position decided by a shape of a lens when a means of an optical system such as the lens homogenizes laser beams. SOLUTION : A laser medium 3 is constituted in such a way that dope concentration of rare earth ions added into a base material of the laser medium 3 becomes higher toward a peripheral edge 33 compared to a center 32 of a cross section 31 crossing a direction of an optical axis 3b of the laser medium 3 so that light 1a to be amplified made incident on the laser medium 3 is emitted as a laser beam 3a formed in the energy distribution of a top hat shape. A laser processing device performing processing by irradiating a workpiece with the uniformized laser beam 3a is used. Even if a distance between a laser head and the workpiece changes, the uniform energy distribution can be obtained on an irradiation face of the workpiece. COPYRIGHT : (C)2011, JPO&INPIT