Depends on duty cycle. It may only need enough power for a couple of big bursts. Chemical lasers might work quite well here if you can address temperature flu

Depends on duty cycle. It may only need enough power for a couple of big bursts. Chemical lasers might work quite well here if you can address temperature fluctuation issues. The power output can be sufficiently massive with a relatively compact storage of that power. The downside is just that they can't be easily recharged.