Abstract
The semiconductor A-FPSA (antiresonant Fabry-Perot saturable absorber) (Fig. 1) has passively mode-locked successfully many different solid-state lasers such as Nd-YLF [1, 2], Nd:YAG [2], Nd:fiber [3] and Nd:glass [4, 5] lasers with ps- to sub-100-fs pulses. So far, the A-FPSA is the only intracavity saturable absorber in an all-solid-state ultrafast laser technology for which the modelocking is always self-starting and stable against Q-switching. The main reason is that the operation parameters, such as saturation intensity, losses, and impulse response of the A-FPSA can be custom designed and adapted to the requirements of solid-state lasers. Knowledge of these parameters therefore is of central importance for the optimization of the mode-locking performance.
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