In this work, we present a novel and practical method for generating optical vortices in highpower laser systems. Off-axis spiral phase mirrors are used at oblique angles of incidence in the beam path after amplification and compression allowing for the generation of high-power optical vortices in almost any laser system. An off-axis configuration is possible via modification of the azimuthal gradient of the spiral phase helix and is demonstrated with a simple model using a discrete spiral staircase. This work presents the design, fabrication, and implementation of off-axis spiral phase mirrors in both low and high-power laser systems.
The recently developed magnetic field-assisted electroless anodization technique enables more morphological tunability by expanding the parameter space available during nanostructure synthesis and limiting the effects of copper electromigration. We synthesized CuO nanodendrites, nanowalls
and nanospheres on both transparent and non-transparent substrates using the magnetic field-assisted anodization of copper foils and vacuum deposited Cu thin films on glass substrates respectively. Non-linear optical characterization of the resulting partially transparent Cu/CuO nanostructures
on glass substrates revealed clear optical limiting behavior. When the fluence of the incident 800 nm radiation from a Ti:sapphire laser was increased from 20 mJ cm−2 to 2 J cm−2, the optical transmittance of the Cu/CuO nanostructures decreased by nearly an
order of magnitude.
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