Publications

Characterization of Distributed Phase Plates for use on Z-Beamlet

Geissel, Matthias G.; Schwarz, Jens S.; Smith, Ian C.; Shores, Jonathon S.

Distributed Phase Plates (DPP) are used in laser experiments to create homogenous intensity distributions of a distinct shape at the location of the laser focus. Such focal shaping helps with controlling the intensity that is impeding on the target. To efficiently use a DPP, the exact size and shape of the focal distribution is of critical importance. We recorded direct images of the focal distribution with ideal continuous-wave (CW) alignment lasers and with laser pulses delivered by the Z-Beamlet facilty. As necessary to protect the imaging sensors, laser pulses will not be performed by full system shots, but rather with limited energy on so-called %60rod-shots', in which Z-Beamlet's main amplifiers do not engage. The images are subsequently analyzed for characteristic radii and shape. All characterizations were performed at the Pecos target area of Sandia with a lens of 3.2 m focal length.