Radiation source

Abstract

An apparatus for emitting electromagnetic radiation includes a gain element, an optical arrangement defining a resonator and arranged to re-direct radiation emitted by the gain element along a beam path back onto the gain element, the optical arrangement including an output coupler configured to couple a portion of the radiation in the resonator out of the resonator, and a pump arrangement configured to pump the gain element. The optical arrangement further includes a passive device placed in the resonator in the beam path, the passive device having at least two surface portions at an angle to each other. The passive device is arranged to direct first radiation portions and second radiation portions of the radiation, which first and second radiation portions are incident on different ones of the surface portions, to be spatially separated. The apparatus is suitable as a source of dual-comb pulsed laser radiation.

Dependencies are inferred from the claim text.