Laser beam smoothing achieved with 1-THz-bandwidth, two-dimensional smoothing by spectral dispersion and polarization smoothing on the 60-beam, 30-kJ, 351-nm OMEGA laser system is reported. These beam-smoothing techniques are directly applicable to direct-drive ignition target designs for the 192-beam, 1.8-MJ, 351-nm National Ignition Facility. Equivalent-target-plane images for constant-intensity laser pulses of varying duration were used to determine the smoothing. The properties of the phase plates, frequency modulators, and birefringent wedges were simulated and found to be in good agreement with the measurements.
© 2005 Optical Society of America
(030.6140) Coherence and statistical optics : Speckle
(030.6600) Coherence and statistical optics : Statistical optics
(140.3580) Lasers and laser optics : Lasers, solid-state
(140.3610) Lasers and laser optics : Lasers, ultraviolet
(350.2660) Other areas of optics : Fusion
Sean P. Regan, John A. Marozas, R. Stephen Craxton, John H. Kelly, William R. Donaldson, Paul A. Jaanimagi, Douglas Jacobs-Perkins, Robert L. Keck, Terrance J. Kessler, David D. Meyerhofer, T. Craig Sangster, Wolf Seka, Vladimir A. Smalyuk, Stanley Skupsky, and Jonathan D. Zuegel, "Performance of 1-THz-bandwidth, two-dimensional smoothing by spectral dispersion and polarization smoothing of high-power, solid-state laser beams," J. Opt. Soc. Am. B 22, 998-1002 (2005)