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In this work, we present a novel and practical method for generating opticalvortices in high-power laser systems. Off-axis spiral phase mirrors are used atoblique angles of incidence in the beam path after amplification andcompression allowing for the generation of high-power optical vortices inalmost any laser system. An off-axis configuration is possible via modificationof the azimuthal gradient of the spiral phase helix and is demonstrated with asimple model using a discrete spiral staircase. This work presents the design,fabrication, and implementation of off-axis spiral phase mirrors in both lowand high-power laser systems.

Off-Axis Spiral Phase Mirrors for Generating High Intensity Optical Vortices