Abstract: Producing high efficiency laser wave mixing and laser harmonic generation laser beams by reconstruction of fundamental and second harmonic laser beams from a frequency doubling crystal by use of a pair of optical wedges. The optical wedges are positioned with their angled surfaces facing each other with substantially 180 degrees of relative rotation and separated at a predetermined distance. The two spaced apart laser beams enter the first optical wedge from the frequency doubling crystal and the two beams converge after exit the first wedge. The converged laser beams enter the second wedge and exit therefrom, forming a coaxially overlapping single beam which is to be used for high efficiency generation of a higher order harmonic laser beam.

Abstract: A modular CO2 laser has two end-flange devices, at least one intermediate-flange device, at least one metallic support tube that is resistant to bending and has two end regions fixedly mounted in the two end-flange devices and a central region to which the intermediate-flange device is secured. A partially-transmitting mirror device is provided at at least one of the end-flange devices, the mirror device comprising a mirror and a massive support plate carrying a mounting for the mirror. An adjusting-screw device is provided, which comprises a reference position forming an origin of X axis and Y axis coordinates. Two metal screws are situated in the X axis and Y axis respectively, the mirror being adjustable by rotation of at least one of the screws. The metal of the metallic support tube has a coefficient of thermal expansion that is not particularly low, and the metal of the metal screws has a particulary low coefficient of thermal expansion.