The process by which divergent rays (white, or natural, light) are converted into parallel rays (coherent light).

A laser operating at a continuous output for a period of time equal to or greater than (≥) 0.25 seconds.  Continuous Wave is abbreviated CW.

Any area where the occupancy or activity of those within its confines is subject to access control and/or supervision for the purpose of protection from laser radiation hazards.

The bending of light rays toward each other, as by a positive (convex) lens.