While high-power 780 nm pulsed lasers are essential for atom interferometry, scaling existing sources is restricted by nonlinear effects and material damage. In this work, we demonstrate a robust 780 nm source based on single-pass frequency doubling in a lithium triborate crystal. The source is driven by a high-power 1560 nm master oscillator fiber power amplifier. Frequency doubling is performed at a maximum fundamental power of 68.7 W, achieving an average output power of 17.2 W at 780 nm at a conversion efficiency of 25.03%. The source operates at a 10 MHz repetition rate with a pulse duration of approximately 2 ns and excellent beam quality (M2 ≈ 1.06). To the best of our knowledge, this represents the highest average power reported for a nanosecond 780 nm source, offering a scalable solution for high-flux quantum sensing.
