We report on the efficient operation of a high-power erbium-doped polycrystalline Er:YAG ceramic laser at 1617 nm resonantly pumped by a high-power 1532 nm Er,Yb fiber laser. Lasing characteristics of Er:YAG ceramics with different Er3+ concentrations are evaluated and compared. With an output coupler of 15% transmission and 0.5 at. % Er3+-doped YAG ceramic as the gain media, the laser generates 14 W of output power at 1617 nm for 28.8 W of incident pump power at 1532 nm, corresponding to a slope efficiency with respect to incident pump power of 51.7%.
A high efficient diode-pumped passively modelocked Nd:Lu3Al5O12 (Nd:LuAG) laser is demonstrated with a semiconductor saturable-absorber mirror for the first time to our best knowledge. With an absorbed power of 10.5 W, a maximum output power of 1.05 W at 1064.4 nm was obtained, corresponding to an optical-optical conversion efficiency of 10% and a high slope efficiency of 60.2%. The mode-locked pulses have a pulse width of 5.4 ps. Our experimental results show that Nd:LuAG crystal could be an excellent alternative for high efficient diode-pumped passively mode-locked pulses generation.
In this letter, a diode-pumped passively mode-locked Nd:Lu1.5Y1.5Al5O12 (Nd:LuYAG) laser is demonstrated for the first time, to the best of our knowledge. With a semiconductor saturable-absorber mirror, a maximum output power of 0.85 W at 1064 nm was obtained under an absorbed power of 8.51 W, corresponding to a high slope efficiency of 44%. The mode-locked pulses were estimated to be 6.6 ps. The results of our experiment show that Nd:LuYAG crystal could be a promising material for diode-pumped ultra-short laser generation.
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