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We present the rapid output power modulation of a 200 W continuous-wave all-fiber ytterbium-doped polarization-maintaining fiber amplifier. Pulse durations of 3 ns and MHz modulation frequencies at full power could be achieved. A fiber-coupled electro-optical modulator was used to modulate the polarization of the seed light, transferring linearly to the polarization at the output of the fiber amplifier. Using a thin film polarizer, the perpendicular polarization components at the output were separated, yielding a polarization dependent amplitude modulation. The laser output power then follows the applied voltage signal to the EOM and could be rectangular, saw-tooth or any arbitrary signal.
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Maximilian Strecker, Till Walbaum, Thomas Schreiber, "Arbitrary MHz output modulation of continuous-wave ytterbium-doped monolithic PM fiber amplifiers by polarization-switching," Proc. SPIE 12400, Fiber Lasers XX: Technology and Systems, 1240004 (9 March 2023); https://doi.org/10.1117/12.2649800