A laser system may include a solid-state laser gain material (LGM) module. The system may also include a multi-pass resonator including a plurality of relay mirrors. The plurality of mirrors may be grouped at least in pairs. A first mirror of each pair of relay mirrors may be positioned to cause a laser beam from the LGM module incident on the first mirror to be reflected to the second mirror, and the second mirror may be positioned to reflect the laser beam back to the LGM module for further amplification. The multi-pass resonator may be configured to provide a high-quality laser beam in the fundamental mode.