Laser fusion
without limits

Xcimer is building the world's biggest, brightest and most powerful lasers to commercialize the only scientifically validated form of fusion energy on Earth.

Xcimer Energy Completes Crucial Experimental Shots at University of Rochester’s Laboratory for Laser Energetics Xcimer publishes roadmap to commercialize laser-inertial fusion
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PHOENIX

Xcimer is the most technically mature laser fusion company.

In 2024, we broke ground on our first high-energy laser system, Phoenix. It’s now up and running.

Located in our Denver laser bay, Phoenix features the first electron-beam-pumped excimer laser built in the private sector, and the first of its kind from any organization in more than 20 years.

Phoenix demonstrates long-pulse excimer laser operation (which unlocks cost savings), and a pulse compression technique known as Stimulated Brillouin Scattering (SBS) to shrink microsecond-long excimer laser pulses down to a nanosecond while avoiding all optics damage challenges.

Phoenix is the world's highest-energy use of SBS. It validates key elements of Xcimer's low-cost, high-energy laser fusion architecture. Now we are ready to scale.

ATHENA

Our work on Phoenix builds toward Athena, the world's first laser fusion power plant.

Athena will represent the start of Earth's commercial fusion energy era.

By 2035, we expect Athena to deliver 400 megawatts of safe, clean, affordable energy, around the clock, with fuel derived from seawater and lithium, cost-competitive with fossil fuels and renewables.

Athena is based on the most credible roadmap in fusion, relying on proven science and commercially scalable technologies. Xcimer's power plant architecture bypasses material science and maintenance challenges, resulting in extremely competitive economics.

Read our detailed roadmap

Laser-driven inertial fusion is the only fusion approach that has been scientifically proven. Read our February 2026 white paper with TRUMPF Laser SE to see how our gas excimer laser architecture makes it economical and scalable.

Read the white paper

Meet the team commercializing fusion

More than 150 engineers, physicists, and business professionals are turning proven science into crucial technology — with industry-leading execution. Learn about our mission, culture and values.

Discover Xcimer

Fusion: The ultimate energy source

Our fusion power plants will unlock energy-intensive industries that require firm, abundant, carbon-free power, from AI training clusters to desalination and industrial decarbonization. Join the team commercializing the ultimate energy source.

Safe

No chain reactions, no meltdowns. Fuel is a kind of hydrogen used in watch dials.

Abundant

Fuel produced from seawater and lithium. Enough fuel for millions of years. No foreign supply chains. 

Economical

We’ve designed our system from the ground up to compete on cost with fossil fuels and renewables.

Clean

No emissions. No pollutants. The only byproducts from our power plants? Helium and heat.

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