Abstract
Results of experimental investigation of diode pumped Nd:YAG laser passively mode locked using either second harmonic nonlinear mirror or semiconductor saturable absorber are reported. As an active element the 10 mm long Nd:YAG rod end pumped by 20 W fiber coupled laser diode was used. The linear folded resonator has on the other end either saturable absorber with single 15 nm thick In 0.25 Ga 0.75 As quantum well layer integrated on the top of Bragg mirror (SESAM) either nonlinear mirror (NLM) consisting of a dichroic dielectric mirror and crystal for second harmonic generation (SHG). With SESAM the 2.5 W of average output power and pulse duration of 21 ps was achieved, using the 3.5 mm long type II KTP crystal we obtained 1.5 W of output power with single pulse duration of 26 ps. Substantial pulse shortening to 9 ps was achieved with a 10 mm long critically phase-matched type I LBO crystal.
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