Laser Pulse Electrical Field (image) Max-Planck-Gesellschaft Share Print E-Mail Caption Figure 2: The electrical field of a laser pulse exerts a strong force on an electron located at the edge of an atom (green cloud around the nucleus).This force changes over time. In approximately only a femtosecond, a trillionth of a second, it changes direction -- at t1 it is strongest towards the right, at t2 it is strongest towards the left and after another femtosecond, at t3, again towards the right. Credit Max Planck Institute for Quantum Optics Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.