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Tm-fiber laser pumped Ho:YAG MOPA system delivering 537 W average output power at a pulse repetition frequency of 10
Abstract:
A pulsed high-power Ho:YAG master-oscillator power amplifier (MOPA) system single-end-pumped by Tm-doped fiber lasers was demonstrated. Through a four-stage amplifier configuration, the maximum average output power of Ho:YAG MOPA system reached 537 W at a pulse repetition frequency of 10 kHz and a pulse width of 52.5 ns, corresponding to the pulse energy of 53.7 mJ and a peak power of 1.017 MW. To the best of our knowledge, this is the maximum average output power for the 2 μm pulsed laser system. Additionally, a polarization-purified laser was obtained by inserting a thin-film polarizer in each amplifier to filter out the depolarized laser. The maximum average output power of the polarization-purified laser was 432 W, and the beam quality M2 factors were measured to be 1.93 and 1.51 in the x and y directions, respectively.
