Simultaneous spectrum and coherent combining by active phasing dual two-tone all-fiber MOPA chains

摘要: We present a new approach for simultaneous spectral and coherent combining in master oscillator power amplifier (MOPA) configuration with active phasing. Spectrally combined single-frequency seed lasers are employed as the all-fiber chain, which provides robust performance suppressing of stimulated Brillouin scattering effect, while spectrally amplifiers phase control stable in-phase combining, despite strong fluctuation. In experiments, two MOPA chains coherently total output 390 W. The main lobe closed loop is times that value open loop, visibility more than 75% long-exposure interference pattern at receiving plane obtained.