J. Phys. IV France
Volume 133, June 2006
Page(s) 797 - 803
Published online 16 June 2006
Inertial Fusion Sciences and Applications 2005
J.-C. Gauthier, et al.
J. Phys. IV France 133 (2006) 797-803

DOI: 10.1051/jp4:2006133161

The mercury laser system - An average power, gas-cooled, Yb:S-FAP based system with frequency conversion and wavefront correction

C. Bibeau1, A. Bayramian1, P. Armstrong1, E. Ault1, R. Beach1, M. Benapfl1, R. Campbell1, J. Dawson1, C. Ebbers1, B. Freitas1, R. Kent1, Z. Liao1, T. Ladran1, J. Menapace1, B. Molander1, E. Moses1, S. Oberhelman1, S. Payne1, N. Peterson1, K. Schaffers1, C. Stolz1, S. Sutton1, J. Tassano1, S. Telford1, E. Utterback1, M. Randles2, B. Chai3 and Y. Fei3

1  Lawrence Livermore National Laboratory, 7000 East Ave., L-482, Livermore, CA 94550-9234, USA
2  Northrop Grumman Space Technologies, Synoptics, 1201 Continental Blvd., Charlotte, NC 28273, USA
3  Crystal Photonics, Inc 5525 Sanford Lane, Sanford, Fl 32773, USA

We report on the operation of the Mercury laser with fourteen 4 $\times$ 6 cm2 Yb:S-FAP amplifier slabs pumped by eight 100 kW peak power diode arrays. The system was continuously run at 55 J and 10 Hz for several hours, (2$\times$105 cumulative shots) with over 80% of the energy in a 6 times diffraction limited spot at 1.047 $\mu $m. Improved optical quality was achieved in Yb:S-FAP amplifiers with magneto-rheological finishing, a deterministic polishing method. In addition, average power frequency conversion employing YCOB was demonstrated at 50% conversion efficiency or 22.6 J at 10 Hz.

© EDP Sciences 2006