| 摘要 |
PURPOSE:To make it possible to correspond to different descriptions of processings in a short time without reducing the stability of emitted light by a method wherein at least one piece of a mirror between a laser oscillator and a condensing part is provided with a protruding part adjustable freely the height of the mirror in the direction of the optical axis of a laser beam. CONSTITUTION:In a laser beam 2 emitted from an oscillator 1, the phase of the central part of the laser beam becomes a slow phase compared to those of the peripheral parts of the laser berm like a phase state 6c and as the laser beam which is incident on a condensing mirror 4 is also brought into a phase state identical with the state 6c, the laser beam which irradiates a work 5 is brought into a condensed state like a condensed state 17. In order to change the state 17 of this laser beam 2, a voltage applied to a piezo-electric element of a drive part 8f is changed, whereby a laser beam like one in a condensed state 16 can be obtained by making equal the right side surface of a concave mirror 8d with the surface of a concave mirror 8e. Thereby, a laser processing device can correspond to different descriptions of processings in a short time without reducing the stability of emitted light. |
