Piezo stacks for optics applications feature a central aperture High-force piezo actuators are suitable for applications requiring fast, nanometer-scale motion while maintaining an unobstructed central opening. (Nanowerk News) PI (Physik Instrumente), a global leader in precision motion control and nanopositioning, offers high-force piezo actuators for applications requiring fast, nanometer-scale motion while maintaining an unobstructed central opening. PI's PICA-Thru tubular piezo actuators for optical and mechanical applications, available in twelve standard sizes. (Image: PI)Higher Force and Longer Travel than Conventional Piezo TubesPICA-Through actuators combined the advantages of conventional stack actuators and tube actuators. As a result, piezo actuators offer high stiffness, rapid response, no backlash, no particle generation, and long operating life.