Abstract
By using mirrors with specially designed transmissions in a diode end-pumped hemispherical cavity, laser oscillations except for 1580 nm were suppressed and an enhanced pulse performance of an acousto-optic Q-switched laser at a single wavelength of 1580 nm was realized for Er:Yb:RAl3(BO3)4 crystals. When the absorbed pump power was 13.5 W and the pulse repetition frequency was 1 kHz, 250 μJ Q-switched pulse energy with a width of 215 ns and 350 μJ Q-switched pulse energy with a width of 125 ns were achieved in Er:Yb:YAl3(BO3)4 and Er:Yb:LuAl3(BO3)4 crystals, respectively. The pulsed laser performances of both the crystals were also compared and investigated in detail.
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