Xcimer Energy Launches Phoenix Prototype, Advancing Commercial Laser Fusion Development
Xcimer Energy has reached a major milestone in its pursuit of commercial fusion power with the launch of operations for Phoenix, a groundbreaking prototype system that represents a critical step toward industrial-scale laser fusion energy production. The company announced that Phoenix, now operational at its Denver, Colorado facility, is the largest privately owned laser system in the world and serves as the foundation for Xcimer’s long-term strategy to commercialize fusion energy.
Located within Xcimer’s 74,000-square-foot laser research and development center, Phoenix was designed to validate a unique fusion architecture that differs significantly from conventional laser fusion approaches. The system combines a krypton fluoride (KrF) excimer laser with Stimulated Brillouin Scattering (SBS) pulse-compression technology, creating a platform that Xcimer believes can overcome some of the economic and engineering barriers that have historically limited the commercialization of fusion power.
The successful startup of Phoenix marks not only an important technical achievement but also the revival of specialized industrial capabilities in the United States that had largely disappeared after the Cold War. According to the company, years of engineering work, talent acquisition, and supply-chain development were required to bring the system from concept to reality.
Demonstrating a New Approach to Fusion Lasers
At the heart of Phoenix is an unconventional laser architecture designed specifically for future commercial fusion applications. Traditional fusion laser systems rely on generating extremely powerful pulses of energy capable of compressing and heating fuel targets to the conditions necessary for nuclear fusion. Xcimer’s solution utilizes a krypton fluoride excimer laser combined with SBS pulse compression to transform relatively long-duration laser pulses into the nanosecond-scale bursts required for fusion ignition.
Phoenix has successfully demonstrated integrated operation between the excimer laser amplification system and the SBS compression stage. The prototype’s light source operates at pulse energies exceeding one kilojoule, while the SBS gas optic section extends approximately 38 meters in length. According to Xcimer, this represents the highest-energy and largest-scale implementation of SBS technology ever achieved within an optical system.
The company views this achievement as validation of a technology pathway that could ultimately enable larger and more economically viable fusion energy systems. By proving that high-energy excimer amplification and SBS compression can work together within a fully integrated platform, Phoenix provides the technical foundation for future commercial-scale laser facilities.
Rebuilding Lost Industrial Expertise
Developing Phoenix required more than simply constructing a new laser system. Xcimer had to recreate a significant portion of the industrial knowledge base associated with large-scale electron-beam-pumped excimer lasers, a technology area that had seen limited development in recent decades.
Following the end of the Cold War, many government-funded programs involving high-energy excimer lasers were discontinued, leading to the gradual disappearance of specialized manufacturing capabilities and technical expertise. Xcimer recognized that advancing commercial fusion would require rebuilding much of this infrastructure from the ground up.
Over the last four years, the company assembled a multidisciplinary team that includes experts in fusion science, laser engineering, pulsed-power systems, advanced manufacturing, and experimental physics. The workforce draws experience from national laboratories, major aerospace programs, the U.S. Navy, commercial technology companies, and previous government-sponsored laser initiatives.
A significant source of technical continuity came from experts associated with the U.S. Naval Research Laboratory, which maintained and operated the only two remaining large-scale krypton fluoride excimer laser systems in the United States. Their experience helped preserve valuable engineering knowledge and contributed to the successful development of Phoenix.
Xcimer co-founder and Chief Executive Officer Conner Galloway emphasized the broader significance of the project, noting that the company’s efforts extended beyond scientific innovation. According to Galloway, Phoenix represents both a major technological achievement and a successful effort to restore advanced laser manufacturing capabilities within the United States.
The project received support from venture capital investors as well as funding from the U.S. Department of Energy, reflecting growing interest in fusion energy as a potential long-term source of clean, reliable electricity.
Learning from the National Ignition Facility
Phoenix arrives at a time when laser fusion has gained renewed momentum following major scientific achievements at the National Ignition Facility (NIF). Operated by the U.S. government, NIF became the first fusion experiment to achieve scientific breakeven, demonstrating that fusion reactions can produce more energy than is delivered directly to the fuel target.
The facility achieved a landmark breakthrough in 2022 by demonstrating net energy gain from a fusion experiment. Continued advancements followed, and by 2025 NIF successfully generated 8.6 megajoules of fusion energy from approximately 2 megajoules of laser input energy.
While these accomplishments confirmed the underlying physics of laser fusion, Xcimer argues that NIF’s design is not suitable for commercial electricity production. The facility was originally built as a scientific research instrument rather than a power-generation platform. Its complex architecture relies on 192 large laser beamlines and extensive maintenance requirements, making it expensive and difficult to scale for industrial deployment.
Xcimer’s strategy is based on the belief that commercial fusion energy will require a fundamentally different laser architecture focused on simplicity, efficiency, and manufacturability.
A Commercially Oriented Fusion Architecture
The company believes krypton fluoride excimer lasers offer several advantages that could make fusion power economically viable. Compared with traditional solid-state glass laser systems, excimer lasers have the potential to achieve higher efficiency while reducing thermal stresses and operational complexity.
One of the most notable differences is the dramatic reduction in system complexity. Whereas NIF employs 192 laser beamlines, Xcimer’s proposed commercial architecture is designed around only two beamlines. This simplified configuration could significantly reduce maintenance demands, lower capital costs, and improve overall system reliability.
Xcimer co-founder and President Alexander Valys stated that NIF successfully proved the scientific feasibility of laser fusion. However, he noted that achieving commercial deployment requires a laser platform that can be produced, operated, and maintained at industrial scales and costs.
The company believes its approach can provide a pathway toward fusion power plants that are practical not only from a scientific perspective but also from an economic one.
Roadmap Toward Commercial Fusion Power
Phoenix serves as the first major milestone in a broader multi-stage development strategy intended to culminate in commercial fusion power generation.
The next major project on Xcimer’s roadmap is Anvil, scheduled for completion in 2028. This system is expected to feature a commercial-scale excimer amplifier capable of delivering approximately 200 kilojoules of energy on target through a complete two-sided beamline configuration. Anvil will provide a larger-scale demonstration of the technologies validated by Phoenix.
Following Anvil, the company plans to develop Vulcan in the early 2030s. Vulcan is envisioned as a significantly larger laser facility capable of producing between 4 and 12 megajoules of energy. The system will be designed to achieve wall-plug breakeven, meaning it could potentially generate as much or more energy than it consumes. Beyond fusion energy development, Vulcan may also support national security missions and advanced high-energy-density physics research. Xcimer expects to identify and announce a site for Vulcan in the near future.
The final stage of the roadmap is Athena, a commercial-scale fusion power plant targeted for the mid-2030s. Athena is intended to provide continuous grid-scale electricity generation using laser fusion technology and would represent Xcimer’s transition from experimental systems to full commercial energy production.
With Phoenix now operational, Xcimer has taken a significant step toward realizing its vision of practical fusion energy. The company believes that by combining advances in laser technology, manufacturing scalability, and system simplification, fusion power can evolve from a scientific achievement into a commercially viable source of clean energy for future generations.
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