Asia & Oceania · Japan
Saturday, June 13, 2026
EX-Fusion
Inertial confinement — diode-pumped laser
Inertial
Deuterium-Tritium
Undisclosed
TBD
Investor brief
Diode-pumped laser inertial fusion from Osaka
Executive Summary
EX-Fusion is an Osaka-University spin-out using diode-pumped solid-state lasers in a counter-illumination geometry — the only meaningful private laser ICF program in Asia. Japan's leading optics industrial base is the strategic enabler.
Strategic Thesis
Japan's optics industry can manufacture DPSSLs at scale — that's the bottleneck that's kept laser fusion in the lab.
Technical & Economic Profile
Architecture class
Inertial Confinement & Laser Drivers
External drivers crush fuel targets in billionths of a second. Post-NIF push toward 10 Hz repetition rates and dramatically higher wall-plug efficiency.
Reactor design
Inertial / Laser Driver
Core tech focus
Diode-pumped solid-state lasers
Key milestones
Osaka University spin-out.
How EX-Fusion sits vs peers
The preeminent Asian laser ICF program. Diode-pumped solid-state architecture leverages Japan's commercial optics manufacturing base.
Class engineering bottlenecks
- Driver wall-plug efficiency: NIF-class flashlamp lasers sit at < 1%; diode-pumped solid-state and GaN blue diodes target 10–20%.
- Target manufacturing throughput: every shot consumes one precision-machined target — economics demand mass production at ¢-class unit cost.
- p-¹¹B Coulomb barrier requires T ≳ 150–200 keV and triple products of 10²⁴–10²⁵ keV·s·m⁻³.
- Rep-rate scaling: NIF fires once per ~6 hours; commercial plants need 10 Hz sustained for years.
LCOE drivers
- Driver capex dominates — diode-pumped solid-state and GaN blue-diode roadmaps target order-of-magnitude wall-plug efficiency gains.
- Target consumable cost per shot scales linearly with energy delivered — manufacturing automation is existential.
- Aneutronic p-¹¹B pivot eliminates the neutron-handling and tritium-breeding capex of D-T ICF.
Sourced from the 2026 Global Fusion Energy Comparison — triple-product thresholds, direct-energy-conversion architecture, materials limits, and the LCOE / Qecon framework.
Founding Team
Spun out from Osaka University's world-renowned Institute of Laser Engineering (ILE), EX-Fusion represents Japan's leading commercial push into laser-driven inertial confinement. Co-founders Dr. Yoshitaka Mori, Dr. Kazuki Matsuo, and Professor Shinsuke Fujioka represent decades of world-class academic expertise in high-power laser optics and fast-ignition targets. By translating their institutional breakthroughs into a commercial platform, the founders are engineering high-repetition-rate laser tracking systems that target and ignite descending fusion fuel pellets with nanosecond precision.
Yoshitaka Mori
PhD in Engineering, Osaka University; laser-plasma physics specialist
Kazuki Matsuo
PhD in Plasma Physics, Osaka University; high-energy-density researcher
Shinsuke Fujioka
PhD in Physics, Osaka University; Professor at the Institute of Laser Engineering
The Problem
Global electricity demand is entering an unprecedented growth phase driven by AI infrastructure, data centers, transport electrification, industrial decarbonization, water desalination, and advanced manufacturing. Solar suffers intermittency, wind capacity-factor variability, natural gas carbon emissions, conventional nuclear cost and deployment speed, and batteries energy-density and duration limits. The world requires a new source of clean, dispatchable baseload energy. Fusion represents the ultimate energy source — the challenge is making it commercially practical.
Counter-Illumination DPSSL Inertial Fusion
Two opposing laser beams illuminate a D-T target from opposite directions, simplifying target injection and chamber geometry relative to multi-beam architectures.
Diode-Pumped Solid-State Lasers
DPSSLs deliver the wall-plug efficiency NIF's flashlamp-pumped architecture cannot.
Counter-Illumination Geometry
Two-beam architecture simplifies the chamber and target injection.
Osaka Optics Supply Chain
Direct access to Japan's leading optics industry — historically the bottleneck for laser fusion.
Fuel Strategy
Deuterium-Tritium
Standard D-T inertial confinement fuel.
Product Platform
Counter-Illumination Laser Facility
R&D laser facility under development.
Energy Conversion
Thermal (Rankine/Brayton)
Neutronic (D-T)
33–40% electrical
Deuterium-tritium fusion releases ~80% of its energy as 14.1 MeV neutrons, which deposit their kinetic energy in a surrounding blanket. The heat drives a conventional steam (Rankine) or supercritical-CO₂ (Brayton) turbine.
Conversion chain
- 1D-T plasma
- 214.1 MeV neutrons (80%) + 3.5 MeV alpha (20%)
- 3Neutrons → lithium-bearing blanket (heat + tritium breeding)
- 4Heat → steam/CO₂ turbine → electricity
The most thoroughly understood fusion fuel cycle, highest cross-section at achievable temperatures, and proven back-end engineering (steam turbines are 19th-century technology). Trade-offs: neutron-induced materials damage, tritium handling, ~33–40% Carnot-limited efficiency.
Economic Vision
Japan's industrial DPSSL supply chain is the missing piece of commercial laser fusion. EX-Fusion is positioned to capture the value if it materialises.
Vision
Asia's commercial laser fusion company.
Mission
Build a counter-illumination DPSSL fusion driver.
Engineering Bottlenecks
- 10 Hz laser repetition at kJ class
- Target injector precision
The description above reflects EX-Fusion's publicly stated technology goals, roadmap and architecture. Many elements — particularly net-energy gain at scale, advanced fuel cycles, and grid-relevant economics — remain ambitious objectives that have not yet been demonstrated commercially anywhere in the fusion industry. Forward-looking statements should be treated as engineering targets, not certainties.
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Citations & Sources
Academic & financial rigor- [01]
The Global Fusion Industry in 2025
Fusion Industry Association · Jul 2025
- [02]
Company disclosures and press releases
EX-Fusion
- [03]
Peer-reviewed plasma physics literature
Journal of Plasma Physics / Nuclear Fusion