This isn't a force field it's a point defense system.
The system can sense when a shock wave generating explosion occurs near a target. An arc generator then determines the small area where protection is needed from the shock waves.It then springs into action by by emitting laser pulses that ionize the air, providing a laser-induced plasma field of protection from the shock waves.
So it won't work in space then. Not much of a force field.
The universe seems neither benign nor hostile, merely indifferent. -- Sagan