Laser-Based Inertial Fusion Energy System Utilizing Optical Enhancement Cavities and a Direct-Drive Reactor Configuration
California. USA – Image : Blue Laser Fusion facility showing laser energy gain
Original source: opg.optica.org, Oct 29 , 2025. Click here for the article link
Abstract
We propose a novel and highly efficient laser inertial fusion energy reactor concept based on the shock ignition scheme, in which laser-plasma instabilities are mitigated through 500-beam, multicolor, slowly rotating polarization laser beam irradiation. The system employs coherent beam-combined fiber lasers injected into high-finesse optical enhancement cavities, which have already demonstrated energy enhancement factors approaching 60,000 and are expected to surpass 100,000. The 1.06 μm laser output is frequency-tripled to 0.35 μm ultraviolet light, resulting in an overall wall-plug-to-ultraviolet-light efficiency of approximately 10%. The reactor integrates a helium-gas-cooled lead-lithium blanket and a direct energy conversion for high-efficiency operation. It is designed for cryogenic deuterium-tritium targets in a direct drive scheme at 1–10 Hz, repetition rate, providing net electric output at 0.1–2.8 GW. This approach offers a compact, scalable, and credible pathway toward practical commercial laser fusion energy.
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About Blue Laser Fusion, Inc.
Blue Laser Fusion, Inc (BLF) is commercializing a proprietary and novel pulsed laser architecture based on its high peak power, efficient, reliable and cost-effective laser optical enhancement cavity (OEC) technology. BLF is pursuing pulsed laser applications in directed energy defense to neutralize advanced threats with instant engagement of targets at the speed of light, with a deep magazine and low cost per shot compared to conventional approaches. Additionally, the company is developing GW scale, safe, secure, clean fusion energy based the proven ignition and gain demonstrated by LLNL NIF in 2022 in order to power economic growth and meet the acute and increasing demand for data centers & Al, EVs, and on-shored manufacturing. BLF has a comprehensive IP portfolio with more than 120 patents and applications internationally. Blue Laser Fusion is based in Santa Barbara, CA with additional operations in Japan.
