Abstract
Pulsed, passive negative feedback mode-locked (PNFM) solid-state lasers have demonstrated very good performances in generating long trains of very short and energetic pulses in several crystalline Nd-doped materials.1,2 PNFM is realized by inserting a GaAs platelet into the cavity of an actively passively mode-locked laser. Two-photon- absorption induced self-defocusing, which limits the intracavity intensity close to the saturable absorber saturation threshold, produces an optimum compression of the circulating pulse and delays the gain depletion, stretching the pulse train by several tens of roundtrips.
© 1991 Optical Society of America
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