High-energy nanosecond all-fiber Yb-doped amplifier

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We demonstrate a high-energy, low-repetition-rate, all-fiber, 1 064-nm Yb-doped fiber laser based on the master oscillator power amplifier structure. Pulse-pumping technology is used to suppress amplified spontaneous emission. A maximum output pulse energy of 5.97 mJ is obtained at 16-ns pulses with an M2 of 2.9.
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