Home/Technical Glossary/Focus Head Focus Head A laser is generally delivered to a workstation by means of a flexible fiber optic cable or fixed mirrors. Typically, the laser is delivered to the work piece at a low power density which requires focusing to enable materials processing. The focus is the tool which takes the “raw” laser beam and focuses to a small diameter typically less than 0.04” down to 0.0005”. A number of different types of focusing heads are available for Nd:YAG and fiber lasers; selection will be based on the application, space and budget. A great benefit of using Nd:YAG and fiber lasers is that an in-line camera can be mounted to the focus head, providing a view of the weld area. This enables the operator to view the weld, provide a means for using vision systems and can confirm that the laser is in focus on the part.