Abstract
While the stability of passively mode locked Nd:YAG lasers has been greatly improved in recent years through addition of intracavity acoustooptic loss modulators, relatively little attention has been given to the Nd:glass laser, especially in the very short pulse regime [1–6]. In the hybrid mode locking approach, the active loss modulation reduces the inherent statistical nature of the early-stage pulse build up, while retaining the effect of the saturable absorber as nonlinear loss element and Q switch for final-stage pulse shortening. We have investigated use of the new fast-relaxing saturable absorbing dye Eastman #5 in active-passive mode locking of an Nd:phosphate glass laser. Its use has led to stable mode-locking performance and generation of ~ 6ps duration pulses, largely free of occurrences of satellite pulse structure.
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