Jag har ingen förklaring till universum men kanske Death Star använde samma spektral strålkombinationskoncept som Lockheed Martin som används i deras "LASER" -vapen - ATHENA.
The prototype uses a technique called spectral beam combining, in which a group of lasers comes together to form a powerful beam that — terrifyingly — provides "greater efficiency and lethality" than other laser weapons currently known to be under development, according to Lockheed Martin.