The character of oscillation spikes during quasi-continuous operation of a ruby laser

Quasi-continuous operation of a ruby laser at room temperature was performed with a crystal placed in the spherical cavity with threshold energy 48 J. The duration of the impulse of stimulated emission was 2700 μsec. The character of spikes was observed and it was found that it is far from sinusoidal. The results of threshold energy measurements for other pumping configurations are discussed and compared with those obtained by other authors.