Custom-Built Kilowatt Laser Robot Slices Trees and Melts Rocks Into Lava

Stabi extends its arm from the shadows with a large barrel mounted to its wrist, and what is inside that barrel is not subtle. A kilowatt class laser capable of cutting through wood at a distance or turning stone into a glowing, molten mess sits at the heart of the setup, mounted in the back of a truck and pointed at a series of test targets. The whole rig was built by Prop Department to explore how high energy laser systems might be put to work in future productions.

They started by using an ancient six-axis industrial robot arm that had been working in factories for years. They next installed some special steel mounts and protective windows, which they had laser-cut from a batch of precision parts ordered online. The actual problem was getting the programming just right so the arm could travel smoothly over a target without any abrupt jerks that could scatter the beam.

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Four tiny targeting lasers sit at the corners of the main barrel, creating a visual outline of where the invisible main beam will hit once the system is turned on. There’s a regular camera on top and an infrared camera down below, which detects heat signatures that the human eye cannot see. To be extra safe, the team installed three safety interlocks to prevent accidental firing, and the operator is required to remove the power plug from the barrel at any stage of setup to ensure that nothing fires until everything is in the proper position.

Power comes from a source hidden in the truck bed. The beam itself delivers a continuous punch equivalent to a thousand watts focused down to a small area. Dark materials absorb energy quickly and heat up, whereas reflective surfaces bounce it back, explaining why certain objects endure longer than others. Every test takes place at night, when no one is around, and the operator is wearing two layers of eye protection.

Early tests started with everyday objects to get a feel for how the laser behaved. An old iPhone held up for a few seconds before the beam carved deep grooves into it, leaving the device looking like it had been through something much worse than a bad drop. A metal can was gone in a second, a clean hole punched straight through. Glass proved more interesting, with a tomato inside a jar heating and steaming before the beam eventually broke through, though the jar itself refused to shatter cleanly.

Coconuts caught fire almost on contact, the outer shell blackening and bursting into flame as the laser continued driving energy into the center. Eggs were a different story entirely. After 15 seconds of direct exposure the shell remained intact and the contents barely warm, a reminder that smooth, light colored surfaces can reflect a surprising amount of incoming energy.

As the tests scaled up, so did the results. Chunks of imported lava rock glowed brilliant orange and began to melt under sustained exposure, while a small piece of sterling silver softened and pooled slightly without ever reaching a full melt, highlighting the difference between an intense focused burst and the steady high temperatures needed to break down denser metals. One particularly interesting result came from a solar panel positioned at a distance across the test area, which registered a slight voltage increase when the beam struck it, suggesting that the same energy can still be harvested as usable power even after traveling through open air.

The final test brought everything together. A small tree stood at the far end of the test area looking completely unassuming right up until the robot arm swung into position and locked onto the trunk. Smoke came first, then a clean line began to form in the wood as the beam burned steadily through. Within seconds the top half toppled and hit the ground with a thud. For all the raw power involved, the cut it left behind looked almost surgical.