Patent ID: 9625728
Date: 2017-04-18
CPC Classifications: G02B

Claim:
1. A method of out-coupling harmonic radiation from an enhancement cavity having cavity mirrors arranged as a ring cavity and a target medium, comprising the steps of: travelling of a fundamental radiation including an optical wavelength in the enhancement cavity, generating second or higher harmonic radiation relative to the optical wavelength in the enhancement cavity by an interaction of the fundamental radiation with the target medium, and separating the second or higher harmonic radiation from the fundamental radiation with a splitting method of spatially splitting the fundamental radiation and the second or higher harmonic radiation from each other, wherein the splitting method comprises the steps of: due to said refractive effect of said plate element the fundamental radiation reflected at said reflective mirror surface and the second or higher harmonic radiation reflected at said exposed plate surface of said plate element travel along different first and second beam paths, wherein the first and second beam paths are non-parallel relative to each other and mutually displaced on the plate surface of the refractive plate element.