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4-channel Coherently Combined Long-term-stable Ultrafast Thulium-doped Fiber CPA

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Abstract

We present the first coherently combined, thulium-doped fiber CPA delivering >100 W average-power and simultaneously >1 GW of peak-power. Incorporating four amplifier channels the laser delivers pulses with >228 µJ energy and <120 fs duration at 1940 nm center wavelength. Excellent long-term stability is achieved with an average power fluctuation of <0.5% RMS over >48 hours – ideal prerequisites for next-generation industrial and scientific applications.

© 2020 The Author(s)

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