All-fiber pulsed amplifier based on photonic crystal fiber

The cleaving and fusion splicing technology of the large-mode-area photonic crystal fiber was explored to achieve all-fiber structure. The amplification of the pulse with 1-10 kHz repetition rate, 10 ns duration and 0.3 nm line-width was experimentally researched. The suppression effect of the amplified spontaneous emission employing forward and backward pumping method was compared. Fundamental mode, 0.6 mJ pulse was obtained at 1 kHz which demonstrated the technical feasibility of achieving high energy and high quality pulse output from this kind of amplifier.