We predict the existence of a new pulsed-laser operation regime, when the phases and polarizations of the two coupled cold-cavity eigenstates of a monomode solid-state laser are taken into account in the derivation of the Maxwell–Bloch equations. This monomode pulsed regime is experimentally observed, without any normal mode locking or Q switching occurring inside the cavity. We obtain close agreement between experiments and theory, even in the simple case of a Nd:YAG microchip laser, for which sech<sup>2</sup> pulses at nearly megahertz repetition rates are readily observed.
© 1999 Optical Society of America
(060.5530) Fiber optics and optical communications : Pulse propagation and temporal solitons
(140.3570) Lasers and laser optics : Lasers, single-mode
(140.3580) Lasers and laser optics : Lasers, solid-state
(140.4050) Lasers and laser optics : Mode-locked lasers
Marc Brunel, Olivier Emile, Mehdi Alouini, Albert Le Floch, and Fabien Bretenaker, "Self-mode-locked pulsed monomode laser," Opt. Lett. 24, 229-231 (1999)