For focussing laser beams in todays industrial proceses, the precise and fast positioning of lenses is essential. To increase performance of laser based applications, it is neccessary to increase the size of the focussing lenses as well as the range of motion. This leads to increased requirements for lens shifting actuators in terms of maximum accelleration and force. In order to meet these challenges, we would like to introduce our new high dynamic linear actuator. It is designed for high precission lens movement with ± 2.5µm positioning accuracy. The minimum movement time is 10ms for 4mm range of movement. This is achieved by improving a voicecoil actuator with a high magnetic flux density Halbach Array and reducing the moving mass and the eddy currents induced into the coil carrier by Simulation based desing optimisation.