Compact 500 W-class ultrafast laser based on multi-core fiber amplification

We present a coherently combined femtosecond fiber chirped-pulse-amplification system based on a rod-type, ytterbium-doped, multicore fiber with 4×4 cores. A high average power of up to >500 W could be achieved with excellent beam quality. This architecture is intrinsically power scalable by increasing the number of cores in the fiber.