Fig. 1. Structure of the proposed laser system.

Fig. 2. Layout of the laser system.

Fig. 3. (a) Amplifier configuration and (b) thermal deposition in the gain medium as a function of (in cm).

Fig. 4. (a) Arrangement of LD modules with the duct and (b) output distribution.

Fig. 5. Laser beam near-field from the preamplifier.

Fig. 6. Laser beam near-field from the booster amplifier.

Fig. 7. Output energy from the booster amplifier with different pumping currents.

Fig. 8. Amplifier fluorescence obtained at the heads with 60 kW (top) and 80 kW (bottom) pump powers.

Fig. 9. Output energy of the laser system at different currents.

Fig. 10. Near-field (left) and far-field (right) image of the laser beam.

Fig. 11. SSG at different pumping currents for 5 mm@3 at.% and 3 mm@5 at.%.

Fig. 12. SSG in the amplifier with 5 at.%@3 mm (left) and 10 at.%@1.5 mm (right).