Abstract
A single longitudinal-mode passively Q-switched 1537 nm pulse microchip laser was realized in an Er:Yb:Lu2Si2O7 crystal. The effects of the pump beam diameter and output mirror transmission on pulse characteristics of the Er:Yb:Lu2Si2O7 microchip laser were investigated, when a Co2+:MgAl2O4 saturable absorber with an initial transmission of 95% was used. At an absorbed pump power of 3.4 W, a 1537 nm single-longitudinal-mode pulse laser with energy of 25.8 µJ, repetition frequency of 0.89 kHz, duration of 4.3 ns, and peak output power of 6.0 kW was obtained, when the pump beam diameter and output mirror transmission were 420 µm and 3.0%, respectively. The beam quality factor of output laser with TEM00 mode was less than 1.3.
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