A system, method and apparatus for rapid, large angle, high-precision steering of one or more beams of light, and in particular, laser beams, using one or more concave reflectors to provide narrow, essentially collimated output beams. Pumping light is made to be incident from a direction perpendicular to a direction of the optical axes of first to fourth laser oscillation light beams 9-1 to 9-4, and to alternately propagate through the transparent member and the laser medium in a zigzag manner so as to pump only resonator mode regions in the laser medium. The device is transitioned to the target power state responsive to the expected residency satisfying a first predetermined threshold.