How is laser in heat treatment use as nuclear fusion?

Nuclear fusion

A few of the world's most powerful and complicated arrangements of multiple lasers and optical amplifiers are used to generate extremely high intensity pulses of light of extremely short duration. Such pulses are arranged that is they impact pellets of tritium-deuterium concurrently from all directions, hoping which the squeezing effect of the impacts will bring on atomic fusion into the pellets. That technique, termed as "inertial confinement fusion", therefore far has not been able to attain "breakeven", which is, so far the fusion reaction generates less power than is utilized to power the lasers, but research continues.