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VOLUME 21 (1975) | ISSUE 4 | PAGE 229
Self-focusing in potassium vapor under two-photon resonant excitation
Self-focusing of laser radiation was observed for the first time in two-photon resonance with 4s—4d 4s— 6 s transitions in potassium vapor. The critical self-focusing intensities were measured. The experimental data agree well with the theoretical ones.