Patent ID: 7813404

Claim:
A laser processing apparatus, comprising: a laser control portion including a laser pumping portion for generating a laser beam; an pumping light transfer medium for transferring a laser beam generated by said laser control portion; and a laser output portion including a laser beam scanning system for performing scanning with a laser beam transferred through said pumping light transfer medium, wherein said laser output portion includes: a crystal solid laser medium extending in one direction, has two end surfaces and generates laser oscillation when pumping light from said laser pumping portion through said pumping light transfer medium enters through said two end surfaces; a splitting part for splitting pumping light outputted from said laser pumping portion into two paths so that different pumping components of pumping light enter through said respective end surfaces of said solid laser medium along said respective split paths; dichroic mirrors placed along said split paths in such a manner as to face said respective end surface, allow pumping light to transmit and reflect laser oscillation light toward said end surfaces; an output mirror placed in such a location as no-interference with said split paths and oriented in a direction approximately perpendicular to said laser oscillation light, and outputs said laser oscillation light from said dichroic mirrors; and condenser lenses placed along said split paths in such a manner as to face said dichroic mirrors and condense pumping light that transmits through said dichroic mirrors so that the diameter of the spot where said end surfaces of said solid laser medium are pumped becomes smaller than in the TEM 00 mode of said solid laser medium, and is formed so that pumping light enters through said respective end surfaces of said solid laser medium and said solid laser medium is pumped, wherein said laser beam scanning system in said laser output portion includes: a Z axis scanner which has a lens through which light enters and a lens through which light is emitted, and can adjust the focal distance of said laser beam by changing the relative distance between said lens through which light enters and said lens through which light is emitted along said optical axes of said laser light emitted from said laser pumping portion and said lenses through which light enters and is emitted in such a state that these optical axes coincide; an X axis scanner or Y axis scanner for performing scanning with a laser beam which transmits through Z axis scanner in the direction of the X or Y axis; and a Y axis scanner or X axis scanner for performing scanning with said laser beam with which the X axis scanner or Y axis scanner performs scanning in the direction of the Y or X axis.