A device for generating electromagnetic radiation includes a light source (1) generating a first radiation (7) at a fundamental wavelength, an optical resonator (2) in which the first radiation (7) circulates, and a frequency multiplier (8) located in the optical resonator (2) which converts the first radiation (7) at least partly into a second radiation (9) at a second or higher harmonic wavelength. The frequency multiplier (8) includes at least one non-linear crystal (10). At least one beam splitter element (12) passed through by the first radiation (7) and the second radiation (9) is coupled to the non-linear crystal (10), wherein the first radiation (7) and the second radiation (9) leave the beam splitter element (12) each in a different spatial direction.