We passively e-switched a diode-pumped Er/Yb:glass microchip laser at a 1.535 mu m wavelength using semiconductor saturable absorber mirrors and demonstrated pulses as short as 1.2 ns. By varying the design parameters of the saturable absorber, the pump power, and the pump spot size, we achieved repetition rates from 300 Hz to 100 kHz with pulse energies up to 4 mu J. (C) 1998 American Institute of Physics. [S0003-6951(98)03725-5].