An investigation was made of a neodymium-glass laser with an emission line < 5·10–3 cm–1 wide, operating under nonspiking free-oscillation conditions producing pulses of ~700 μsec duration. At threefold excess of the pumping over the threshold the output energy was ~30 J. The radiation emitted by this laser was used to control the radiation of a second neodymium-glass laser, which was Q-switched. The Q switching was performed by a rotating prism. When the second laser was injected with narrow-line radiation from the first laser, it produced giant pulses of 30 nsec duration and 0.4 J energy in the form of a line 7·10–3 cm–1 wide. In the absence of such injection the natural width of the emission line of the Q-switched laser was ~14 cm–1.
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Zubarev et al. (1972) studied this question.