Laser assembly with intra-cavity frequency conversion

The arrangement has a laser resonator whose length corresponds to the sum of the lengths of its 2 arms with an output coupling optical prism into which the frequency converted output beam is coupled and from which the beam is coupled out parallel to the first arm's optical axis. The frequency converted output beam can be coupled out after internal reflection at a total reflection surface(s); the output axis and first arm optical axis coincide. The arrangement produces a frequency converted output beam with a laser resonator (1) with first (2) and second (6) arms and a length corresponding to the sum of the lengths of the first and second arms and an output coupler (4) in the form of an optical prism (5) into which the frequency converted output beam is coupled and from which the beam is coupled out in the output axis direction parallel to the optical axis of the first arm. The prism is implemented so that the frequency converted output beam (10) can be coupled out at the output coupling surface after internal reflection at at least one total reflection surface (11), whereby the output axis and the optical axis of the first arm coincide.