100GW Laser Interstellar Wafer Sail Model

Underwrite phased-array ground optical laser facilities combining 100 Gigawatts of coherent laser light to push 1-gram silicon wafer nanocrafts to 20% speed-of-light (0.2c), reaching Alpha Centauri in 20 years. Model deep space science mission milestones ($280M/launch campaign), and 20-yr project IRR.