Method for limiting the deflection of a laser head during temperature changes and a laser head

A laser head with limited deflection during temperature changes comprising:

• an upper wall;
• side walls with bushings;
• a lower wall;
• a front wall, wherein the lower wall is constructed such that the lower wall is smoother than the front wall;
• a rear wall with elements of an optical resonator;
• and
• metal plate parts with low specific weight and high thermal conductivity attached by a thermally conductive joint to the side walls and connecting at least one of a warmest or a coldest upper wall and at least one of the coldest or the warmest lower wall of the laser head.