Once the fuel bubble is centered, powerful acoustic compression waves are launched to rapidly converge inward toward it. Crucially, a split second before the sound waves reach the center, an intense burst of light is fired into the molten FLiBe, “pumping” the entire volume and rendering it laser-active. The idea is that the incoming acoustic shock will cause the bubble to implode and become extremely hot, emitting a brilliant flash of blackbody radiation. That flash of photons - the sonoluminescent “photon-burst” - then serves as a seed to trigger a cascade of laser emissions in the surrounding excited liquid. That cascade, powerfully amplified, is destined to return - after reflecting from the sphere’s inner wall - and deposit its energy into the fuel, thereby igniting it. This category pertains to the feasibility of that triggering mechanism.