Beyond ASML: China rethinks EUV race with light-source strategy

China's EUV pivot is not a catch-up play—it is a redefinition of the problem. With LPP light-source subsystems (CO2 lasers, vacuum chambers, collector optics) locked down by export controls, attacking the physics of light generation itself is the only path that breaks the dependency loop. Technical cascade: If solid-state or free-electron laser sources validate, the entire EUV tool architecture must be redesigned—collection efficiency, pulse energy density, and wavelength stability all shift. Downstream mask substrates, photoresists, and metrology stacks iterate in lockstep. This is not a drop-in replacement. Supply-chain compliance: Current control lists target finished tools and named components. A different physical route maps to entirely different controlled items, creating a regulatory seam for domestic sourcing while simultaneously eroding ASML's parts-ecosystem moat. Competitive response: ASML's rational move is accelerating High-NA (450mW→1000mW) volume production to widen the generational gap. Nikon and Canon may exploit the "decoupled light source" narrative to contest the 28–7 nm mid-range. 12–24 month outlook: Expect pilot-line data from alternative sources by H2 2025; the High-NA volume-production window lands in H1 2026. The real inflection point is not lab performance but whether the light-source–optics–control triad crosses 90% yield.