Direct-drive inertial confinement fusion (ICF) targets require extremely uniform laser beam profiles to prevent the growth of unwanted hydrodynamic instabilities. Two approaches have been taken to meet beam-smoothing requirements of direct-drive ICF: 1) using random phase plates to break the beam up info fine-scale speckle, which the target is able to smooth by thermal conduction, and 2) causing that speckle structure to rapidly vary in time to give a lime-averaged smooth beam.2 3 Earliest implementation of temporal smoothing was achieved using induced spatial incoherence (ISI)2; more recent application employs smoothing by spectral dispersion (SSD).3

© 1991 Optical Society of America

PDF Article


You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
Login to access OSA Member Subscription