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(IFP/03) Laser Diode Pumped Nd:Glass Slab Laser for Inertial Fusion Energy

M. Yamanaka1), T. Kanabe1), H. Matsui1), R. Kandasamy1), Y. Tamaoki1), T. Kuroda1), T. Kurita1), M. Nakatsuka1), Y. Izawa1), S. Nakai1), T. Kawashima2), Y. Okada2), T. Kanzaki2), H. Miyajima2), M. Miyamoto2), H. Kan2)
 
1) Institute of Laser Engineering, Osaka University, Osaka, Japan
2) Hamamatsu Photonics K.K., Shizuoka, Japan

Abstract.  As a first step of a driver development for the inertial fusion energy, we are developing a laser-diode-pumped zig-zag Nd:glass slab laser amplifier system HALNA 10 (High Average-power Laser for Nuclear-fusion Application) which can generate an output of 10 J per pulse at 1053 nm in 10 Hz operation. The water-cooled zig-zag Nd:glass slab is pumped from both sides by 803-nm AlGaAs laser-diode(LD) module; each LD module has an emitting area of 420 mm x 10 mm and two LD modules generated in total 218 (max.) kW peak power with 2.6kW/cm2 peak intensity at 10 Hz repetition rate. We have obtained in a preliminary experiment a 8.5 J output energy at 0.5 Hz with beam quality of 2 times diffraction limited far-field pattern, which nearly confirmed our conceptual design.

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IAEA 2001