Abstract
In the current inertial confinement fusion laser drivers, integrated fiber front-end is widely applied to generate the phase-modulated, linearly polarized laser pulses with an output energy of several nano-joules. In this contribution, we design an amplifier with polarization-maintaining optical components. The amplification of the phase-modulated 3 ns, 0.24 nm pulse is experimentally demonstrated in the ytterbium-doped large-mode-area (11 μm-diameter) fiber amplifier. The pulse energy is amplified to around 4 μJ which is free of pulse distortion and stimulated Brillouin scattering. The modulation degree after optimal compensation of waveplates is less than 6%. The output mode field is diffraction-limited.
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