Abstract
The pulsewidth of a flash-lamp pumped Nd:YAG laser in a 120 cm-long linear cavity was significantly shortened by the joint operation of double CPM (Colliding Pulse Mode-locking) and FCM (Feedback Controlled Mode-locking). For double CPM with two saturable absorber cells of 0.5 mm thickness at one quarter of the cavity length apart from the end and coupling mirrors, the shortest pulsewidth was 7.3 ps for Gaussian shape (6.6 ps for sech2). The interval between pulses was 2 ns, a quarter of one round trip time in the cavity, while the number of pulses increased four times more than that for the dye cell contacted mirror in a train of about 100 ns duration. In addition, for the joint operation of double CPM and FCM with insertion of a 0.45 mm-thick GaAs wafer in the cavity, the generated pulses of 10 μJ energy had the shortest duration of 4.0 ps (3.6 ps) with good stability, at a high repetition rate of 0.5 GHz in a long stable train of about 500 ns.
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