GEOST proposes to develop a non-lethal weapon system based on dual-pulse femtosecond-nanosecond generation of plasma effects (such as flash-bang, thermal, and intelligible voice) at range. In this approach, the femtosecond laser pulse creates a dilute plasma filament, location of which is controlled through the temporal chirping of the laser pulse. The subsequent application of a high-energy nanosecond laser pulse results in the seeded optical breakdown in the filament region. The creation of the dense plasma spark is accompanied by a bright flash of visible fluorescence and a loud audible signal, both of which will serve as non-lethal deterrents. Additionally, the integration of a beam modulation controller will allow the system to vibrate the plasma ball producing intelligible voice. In this program, we will leverage our unique experience with experiments and computer simulations of femtosecond laser filamentation in transparent media and our capabilities in commercialization and weaponization of advanced optical concepts. The final design concept and integration approaches formulated in this program will address key military suitability issues such as overall system size, weight, power consumption, and thermal cooling.femtosecond lasers,Nonlethal Flashbang Effects,Ultra-Short Pulse Lasers,Nanosecond Lasers,Laser induced plasma
