Formation time and resonator loss in a Q-switched ruby laser

Measurements of the variation of formation time of a Q-switched ruby laser as a function of loop gain are presented. The loop gains were calculated from integrated pump intensities and the measured resonator loss at threshold. The relationship between formation time and loop gain predicted by fast Q-switching theory was confirmed. Although large optical distortions are to be expected in rubies pumped to Q-switching levels, no indication of increasing resonator loss was found under these conditions.