A Cr4+:Gd3Sc2Ga3O12 (Cr4+:GSGG) broad-band saturable absorber has been
demonstrated to be an excellent passive Q-switch for the flashlamp-pu
mped tunable Cr3+:LiCaAlF6 (Cr:LiCAF) laser at room temperature. A sin
gle Q-switched laser output pulse of 11 mJ in energy and 37 ns in dura
tion at 778 nm was obtained in a nonoptimized laser.