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VOLUME 37 (1983) | ISSUE 5 | PAGE 243
Lithium niobate laser with frequency-degenerate pumping
For the first time, lasing has been achieved in a frequency-degenerate four-wave interaction of beams from a helium-cadmium laser in lithium niobate crystals with nonlocal nonlinearities. The nonlinearities result from a redistribution of space charge during diffusion of the photoexcited carriers or from photovoltaic currents that oscillate over space.