MONITORING OF A HIGH-POWER PULSED RUBY-LASER

A high-power pulsed ruby laser was used to take holograms of neutrino interactions in the Fermilab 15-foot Bubble Chamber. This paper describes a system to monitor and record its most relevant parameters such as the light pulse energy, its width and shape, and the spatial intensity distribution. A second aim of this system was to help in the alignment of the laser beam towards the dispersing lens, located inside the Bubble chamber, as well as to provide a fast check of the alignment without interrupting the holographic recording. This system was required to work in the strong magnetic field (∼0.5 T) surrounding the 15-foot Bubble Chamber, which introduced additional technical problems. © 1990.