【摘 要】
：
An all-fiberized and narrow-bandwidth master oscillator power amplification (MOPA) system with record output power of 4 kW level and slope efficiency of 78% is demonstrated. Tandem pumping strategy is tentatively introduced into the narrow-bandwidth MOPA
【机 构】
：
CollegeofAdvancedInterdisciplinaryStudies,NationalUniversityofDefenseTechnology,Changsha410073,China
【出 处】
：
HighPowerLaserScienceandEngineering
论文部分内容阅读
An all-fiberized and narrow-bandwidth master oscillator power amplification (MOPA) system with record output power of 4 kW level and slope efficiency of 78% is demonstrated. Tandem pumping strategy is tentatively introduced into the narrow-bandwidth MOPA system for thermally induced mode instability (TMI) suppression. The stimulated Brillouin scattering (SBS) effect is balanced by simply using one-stage phase modulation technique. With different phase modulation signals, SBS limited output powers of 336 W, 1.2 kW and 3.94 kW are respectively achieved with spectral bandwidths accounting for 90% power of 0.025, 0.17 and 0.89 nm. Compared with our previous 976 nm pumping system, TMI threshold is overall boosted to be
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