But the time has finally come where those weapons are capable of being fielded, according to a trio of Lockheed Martin executives who work on the development of the company's laser arsenal.
"The technologies now exist," said Paul Shattuck, company director for Directed Energy Systems. "They can be packaged into a size, weight, power and thermal which can be fit onto relevant tactical platforms, whether it's a ship, whether it's a ground vehicle or whether it's an airborne platform.
"So everything exists today," he said, "it's just a question of the desire and when is that going to occur."
Added Daniel Miller, Senior Fellow for Air Vehicle Science and Systems with Lockheed's Skunk Works division, "the question is moving from, 'Do we have the devices?' to 'How quickly can we integrate them on the platform?' The question has changed dramatically on the last decade."
In essence, it's no longer a technological problem to make laser weapons work. It's one of integration at the service level.
Asked flatly if the services came to them tomorrow and asked for a laser weapon in the 30 KW range to be delivered, the two men, along with Robert Afzal, a senior fellow with Laser and Sensor Systems, agreed they could produce a viable weapon for fielding.
That doesn't mean that giant city-melting lasers are on their way. Right now, the weapons are limited to the 15-30 KW scale; going much further requires figuring out how to deal with atmospheric interference, an issue which becomes more complicated with weapons mounted on airborne systems.
But a 30 KW weapon can still bore a hole through a two inch piece of steel in seconds, said Shattuck, which is enough to disable an incoming rocket or hit the engine of a pickup truck. For the Pentagon, that is particularly key, as it has openly talked about the costs associated with using kinetic weapons to attack small trucks operated by the Islamic State group, commonly known as ISIS or ISIL.
A number of advancements in recent years have allowed the company to move forward with laser technology, but the biggest one is the movement in fiber-laser technology, which is largely driven from developments in the commercial sector.
The men described the technology as similar to a rack of servers. Once you figure out how to connect them all, you can add more power by adding another server. The same is true for the laser weapons: you add more power slots into the rack and increase its power.
So while the 30 KW weapons may be the ones that are deliverable now, scaling up is more a question of figuring out details than developing a wholescale new technology.
Lockheed is on track to deliver a 60 KW laser for the Army by the end of the year, known as the RELY program, said Afzal, saying "we're underway. So we're building hardware right now and we're beginning the integration."
Meanwhile, the Navy is using an advanced laser weapon aboard the Afloat Forward Staging Base Ponce, which has been deployed to the Gulf.
Aaron Mehta was deputy editor and senior Pentagon correspondent for Defense News, covering policy, strategy and acquisition at the highest levels of the Defense Department and its international partners.