The narrow linewidth of the OTS (optical tweezing source) makes this laser unique, optimizing the light source for all optical tweezing applications. The beam quality and power stability make the laser a multi-purpose tool. The OTS is a compact CW fiber laser, delivering output powers up to 20 W with a near diffraction limited beam. Patented injection technology allows the use of highly reliable broad area laser diode pumps for a cost-effective maintenance-free operation. The all-fiber design guarantees the robustness of the laser without any optical parts to align or to stabilize.