Laser specs

And like its predecessor, the station had a superlaser focus lens positioned in its upper hemisphere and a trench that ringed the equator. However, it had none of the former Death Star’s design flaws. The redesigned superlaser would require mere minutes—not hours—to be recharged, and could be focused more finely, allowing it to fire at moving targets, such as capital ships. With a projected diameter of 160 kilometers and a substantial increase in firepower, the new Death Star would be not only larger than the original but also much more lethal.

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Star Wars®: Episode VI: Return of the Jedi™ Chapter 1