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VOLUME 41 (1985) | ISSUE 9 | PAGE 399
Observation of narrow resonances in the output spectrum of a laser with nonlinear absorption
The first direct observation of a new type of nonlinear-absorption resonance is reported. This is a resonance in the output spectrum of a laser with a nonlinear absorption which occurs when the width of the output line is significantly greater than the width of the resonance. Experiments show that at a low gas pressure the width of the resonance for vibrational-rotational transitions of molecules is determined exclusively by the collisional width.