High-intensity laser pulses are focused in the air to create plasma, or ionized gas, which emits energy in the form of light. The team did not elaborate on how the 3D scanner was utilized to accurately arrange the pixel dots and form the characters in the air. The brief pulses have a duration of just femtoseconds, or one millionth of one billionth of a second, or one quadrillionth of a second. The peak power of Cao's laser pen can reach a million megawatts due to the incredibly brief pulse duration, which is comparable to the whole utility-scale electricity producing capacity…