Figure from the DOE Report February, 2016

February 2016 DOE Report

OMEGA Graxicon

The uniform and efficient coupling of laser light to cryogenic targets is critical to achieving stable high-pressure implosions on OMEGA. One of several approaches for the mitigation of cross-beam energy transfer on the OMEGA laser involves decreasing the energy near the edge of the spherical target as the radius shrinks during the implosion.

Shown here: with a dispersion-corrected Graxicon located at the end of the laser, temporal wavelength shifting could be used to zoom the focal spot. A spectrally matched distributed phase plate (DPP) would be used to maintain the required focal-spot profile on target.

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