Lai P.-YChang C.-LHuang S.-LSHENG-LUNG HUANG2021-09-022021-09-0220181559128Xhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85046283874&doi=10.1364%2fAO.57.003551&partnerID=40&md5=8664f93b87d8f37db7692b7c4c0b78fbhttps://scholars.lib.ntu.edu.tw/handle/123456789/581126The multipass scheme for a diode-seeded fiber master oscillator power amplifier with a nanojoule-to-millijoule output energy level at a repetition rate of <100 kHz is numerically analyzed for comparison to an experimental benchmark. For a 6/125 single-mode preamplifier with a small input energy (<1 nJ), there is a significant improvement in the output energy from 0.7% to 80% and 95% of the maximum extractable energy using the double-pass and four-pass schemes, respectively. For a 30/250 large-mode-area power amplifier using the double-pass and forward pumping scheme, the required input energy is decreased from 100 μJ to 18 μJ for millijoule energy extraction with accompanying Stokes waves of less than 10% of the total energy. The system based on the full master oscillator power amplifier configuration with an output energy exceeding millijoule level can be optimally simplified to two stages for commercialization. ? 2018 Optical Society of America.Diode amplifiers; Power amplifiers; Energy extraction; Experimental benchmarks; Fiber master-oscillator; Forward pumping; Large mode area; Master oscillator power amplifiers; Output energy; Repetition rate; Fiber amplifiersjournal article10.1364/AO.57.003551297265232-s2.0-85046283874