Noise Suppression via Gain‐Dispersion‐Managed Nonlinear Amplification in a High‐Power Er‐Fiber Laser

High‐power and high‐energy fiber lasers are indispensable tools for both fundamental science and industrial manufacturing, yet their simultaneous scaling remains challenging due to nonlinear effects, limited energy‐transfer efficiency, and noise accumulation. Here, we demonstrate for the first time a gain‐dispersion‐managed nonlinear amplification scheme in the pre‐amplifier stage that can simultaneously suppress phase and intensity noise and therefore enable subsequent promising high‐power amplification. Experimentally, seeded by a gain‐dispersion‐managed nonlinear low‐noise pre‐amplifier, the high‐power fiber laser delivers polarized pulses with 102.3 W average power and 1.19 µJ pulse energy at a repetition rate of 85.69 MHz. The scaled pulses are subsequently compressed to 380 fs using a grating‐pair compressor. Near‐linear power scaling is achieved in the high‐power amplifier with a slope efficiency of approximately 40%, and no obvious saturation is observed, indicating the potential for even higher output power with improved thermal management. Our method therefore provides a feasible approach for applications including high‐fidelity time‐frequency dissemination across ultra‐long distance, GPS navigation and satellite communication.