A fast high radiance ablating laser pump of novel design has been constructed and its radiative characteristics have been determined. Performance of the lamp for exciting a ruby crystal of 0.580 in. diameter and 8 in. length has been established. Total stimulated emission energies in the range 10 joules to 30 joules, depending on individual rods, have been verified. Laser energy was emitted in times near 25 micro sec. The stimulated emission pulse consisted of a series of spikes highly regular with respect to their mutual separation and peak power. Maximum measured peak spike power was 2.5 x 1,000,000 watts. (Author).