Quasi-continuous-wave diode-pumped Yb:YCOB monolithic laser with peak power beyond 200 W

High-power diode-pumped solid-state lasers (DPSSLs) can support many important applications owing to their simple setup and high efficiency.However, the thermal effect in the laser crystal is a major limiting factor for laser power improvement.Here, we originally present a quasi-continuous-wave (QCW) diode-pumped monolithic Yb 3+ -doped YCa 4 O(BO 3 ) 3 (Yb:YCOB) laser and realize the power scaling at room temperature by removing the heat efficiently.The Yb:YCOB laser at 1024 nm is designed with a quantum efficiency of 95%.A high-power QCW laser is realized with an output peak power of up to 226.7 W, a pulse energy of 12.2 mJ, and an optical-to-optical efficiency of 41.2%.To the best of our knowledge, this result represents the record peak power in Yb:YCOB lasers and should have promising applications in some modern devices requiring high-power and large-energy lasers.