High-power Innoslab amplifier with a multi-segmented composite Yb:YAG crystal

We demonstrate a high-power Innoslab amplifier based on a multi-segmented composite Yb:YAG crystal.A systematic comparison was performed of the laser amplification output performance of the multi-segmented and conventional Yb:YAG crystals to demonstrate the feasibility of using gain media with multiple doping concentrations in Innoslab laser amplifiers.We achieved an amplified output of 245 W based on the multi-segmented composite Yb:YAG crystal Innoslab amplifier, with a beam quality of M 2 = 1.21 1.25 and an optical-to-optical efficiency of 38.9%.Thanks to the unique doping structure of the composite crystal, compared to homogeneous dopant crystals, the average output power, optical-to-optical efficiency, and beam quality were significantly improved.Exceptional output power stability with an RMS fluctuation of 0.11% and pointing stability of ~7.5 rad were achieved.