HIGH HARMONIC GENERATION RADIATION SOURCE

摘要

Methods and corresponding apparatus operable to cause an interaction between a drive radiation beam and a medium for generation of emitted radiation by high harmonic generation, the arrangement comprising: an interaction region positioned at an interaction plane and configured to receive the medium; a beam block positioned upstream of the interaction plane at a beam block plane and configured to partially block the drive radiation beam; at least one lens positioned upstream of the interaction plane and downstream of the beam block plane; and an aperture positioned downstream of the interaction plane at an aperture plane and configured to allow at least part of the emitted radiation to pass through and to block at least part of the drive radiation beam, the aperture plane being positioned with respect to the beam block plane and the lens such that an image of the beam block is formed at the aperture plane.