Because Q-switched and MOPA (master oscillator power amplifier) nanosecond fiber lasers have peak powers high enough for ablation and ionization of metals and other solids, they can be used for laser-induced breakdown spectroscopy (LIBS). We are currently developing LIBS sensors using fiber lasers. High repetition rate fiber lasers have the advantage over more conventional flashlamp-pumped Nd:YAG lasers that typically operate at 10 Hz: High repetition rate translates to higher signal-to-noise ratio (SNR) and faster acquisition time.