A midinfrared (mid-IR) saturable absorber mirror (SAM) was fabricated by coating aluminum film on crystal, based on the vacuum evaporation method. By employing the prepared SAM, we demonstrated a high-power passively Q-switched -doped (ZBLAN) fiber laser at . The highest output power in excess of 1.01 W was obtained with a pulse energy of and pulse duration of , corresponding to a repetition rate of 88.84 kHz. To the best of our knowledge, these values represent the highest output power/pulse energy from a passively Q-switched ZBLAN fiber laser around . Our results demonstrate that SAM is a promising device for high-power/high-energy pulse generation in compact mid-IR fiber lasers.