Mode locking of solid-state lasers using metal nanocomposites as slow saturable absorbers (SAs) is studied theoretically. The derived equation for the transient nonlinear response of metal nanocomposites is based on the semiclassical two-temperature model. The model is confirmed experimentally by pump-probe measurements on Au nanoparticles (NPs). The theory was applied to study passive mode locking of a solid-state laser containing Au NPs as SA in the green spectral range. Pulse durations as short as 100 fs are predicted, and design criteria of metal NP SAs are derived.
© 2012 Optical Society of America
Original Manuscript: January 4, 2012
Revised Manuscript: February 27, 2012
Manuscript Accepted: March 4, 2012
Published: April 27, 2012
Kwang-Hyon Kim, Uwe Griebner, and Joachim Herrmann, "Theory of passive mode locking of solid-state lasers using metal nanocomposites as slow saturable absorbers," Opt. Lett. 37, 1490-1492 (2012)