Single-frequency Q-switched Er:YAG laser with high frequency and energy stability via the Pound–Drever–Hall locking method

We present an injection-seeding Q -switched 1645 nm Er:YAG ceramic laser with high frequency stability and energy stability by combining the injection-seeding technique and Pound–Drever–Hall technique. 10.31 mJ single-frequency pulses with optimal frequency stability (525 kHz) and relative energy stability (0.52%) at a high pulse repetition rate of 1 kHz are obtained. To the best of our knowledge, this is the highest frequency stability and energy stability so far in a high pulse repetition frequency, large pulse energy, single-frequency Q -switched Er-doped solid laser. This single frequency laser with high stability provides an excellent light source for a coherent lidar system.