Innovations in commercial laser architectures for inertial fusion

While the National Ignition Facility utilizes legacy glass amplifiers, commercial inertial confinement fusion (ICF) startups are engineering novel laser architectures capable of the high repetition rates required for power generation. Xcimer Energy is developing a unique high-energy Krypton-Fluoride (KrF) excimer laser architecture. Concurrently, Blue Laser Fusion is pursuing an optical enhancement cavity (OEC) laser system designed specifically to ignite aneutronic proton-boron (p-B11) fuel targets.

KrF excimer lasers offer inherently high efficiency and broad bandwidth, making them attractive for fast-ignition schemes where precise temporal pulse shaping is critical. Xcimer's modular approach scales by adding laser units rather than rebuilding a monolithic facility, a capital-cost advantage that the company argues is essential for commercial viability.

Blue Laser Fusion's OEC system aims to drastically increase wall-plug efficiency by recirculating laser light within a resonant cavity until it reaches ignition threshold, rather than firing a single massive pulse. Both approaches target the same economic metric: bringing the levelized cost of energy (LCOE) of ICF plants down to commercially viable levels.