New optimization criteria for slit-apertured and gain-apertured KLM all-solid-state lasers

The aim of this paper is to discuss the limitations of the conventional mod e-locking parameter delta, and to introduce new Kerr-lens mode-locking (KLM ) criteria that we believe to be more reliable indicators of the preference for mode-locked operation in real-world diode-pumped lasers. The new crite ria take into account both the losses at an intra-cavity slit and the gain- aperturing by the pump profile in the laser medium. The criteria are compar ed to the conventional delta criterion and applied to both 4-element and 3- element cavities, The interplay of gain aperture and slit aperture KLM is i nvestigated for 4-element systems. (C) 2000 Published by Elsevier Science B .V.