Kilojoule energy output capability evaluation of tens-nm broadband laser in SG-Ⅲ prototype laser facility

In the SG-Ⅲ prototype laser facility, if the lasers narrow bandwidth is adjusted to broadband while maintaining the main configuration, the energy output will decrease. This article evaluates the kilojoule energy output capability of tens-nm broadband laser, using numerical simulation softwares SG99 and CPAP respectively for narrowband and broadband laser propagation and amplification, and the program of one-dimension reverse propagation and amplification. The result shows the growing of gain-narrowing effect under broadband condition. The compensation of gain-narrowing is studied. With compensation, while losing 40% of the input energy, the output energy can reach 2 000~3000 J under 3 J injection. Hence there should be at least 5 J energy output after the preamplifier. This research will conduct the implementation plans for tens-nm broadband 2 laser system.