Abstract

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.

© 2020 Optical Society of America

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