No. While personal protective equipment (PPE) is required to keep individual workers safe, total or limited enclosure of beam paths can also effectively control laser hazards. Engineering controls for lasers include posting appropriate laser warning signs and having interlocks on its protective housing.
To apply administrative and procedural controls, make sure that Class 3B and Class 4 lasers are operated by qualified and authorized personnel and that standard operating procedures or SOPs are available, including alignment procedures and limitations on spectators.