Abstract
We report experimental results on the mode-locked operation of a flash-lamp-pumped Nd:YAG laser using the recently developed technique based on nonlinear polarization evolution in a second-harmonic-generation crystal. It is the first time such a technique has been applied to a pulsed laser. A pulse train with duration close to 25 ps has been produced using two different configurations. One was based on a phase-matched type II crystal (KTP); the other one used, for the first time, a mismatched type I crystal (KNbO3). Mode-locking threshold and performances are compared between the two types of crystal.
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