Laser beam directors have grown from centimeter size to near two meters in the last 20 years. As the size increased, they began to adopt the appearance of large astronomical telescopes, while retaining the operational features of high speed tracking mounts. This paper describes the current generation of beam directors and discusses design requirements for larger mounts.
J. E. Kimbrell,
D. H. Ditto,
"Design Considerations For Large Beam Directors", Proc. SPIE 0779, Electromechanical System Interaction with Optical Design, (6 October 1987); doi: 10.1117/12.940473; https://doi.org/10.1117/12.940473