BBO is a popular nonlinear optical crystal typically used for frequency conversion. Recently, BBO was also used as electro- optic Q-Switch material. BBO was chosen as a good candidate material for use as an E-O Q-Switch for Er:Glass lasers because of its low insertion losses at 1.54 micrometer and high laser damage threshold (5GW/cm2, 10 ns). Traditional materials such as KD*P or LiNbO3 exhibit high insertion losses and/or low damage thresholds at 1.54 micrometer. As an added benefit, BBO does not exhibit a piezoelectric effect. All of these advantages make BBO an attractive Er:Glass E/O Q- switch for high peak and high average power applications.