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9 June 2014 Highly-efficient, high-energy pulse-burst Yb-doped fiber laser with transform limited linewidth
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A 1um fiber laser outputting high energy (<1mJ) pulse-bursts with high peak powers (<15kW) and narrow linewidth (<300MHz) is an attractive pump source for tunable periodically poled crystal (PPx) based OPA’s which are used in gas sensing, imaging and communication applications. Here a turn-key 1064nm PM Yb-doped fiber amplifier capable of generating high pulse burst energies with transform limited linewidth is presented. The ~20W average power capable laser is optimized for high energy (0.5-2mJ) and high peak power (<10kW) operation at low duty cycles (<0.1%). The laser is capable of operating at <10x the saturation energy level of the final stage gain fiber and achieves a high level of pulse-to-pulse peak power uniformity within pulse-burst. Stimulated Brillion Scattering (SBS) limited micro pulse energy up to 40uJ is achieved and SBS dependence on micro pulse width and separation are characterized. High wall plug efficiency (<20%) for the FPGA controlled system is maintained by temporal and spectral ASE suppression and by spreading the necessary pulse pre-shaping losses (~12dB) to three different amplitude modulation points in the amplifier chain.
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Doruk Engin, Ibraheem Darab, John Burton, Jean-Luc Fouron, Frank Kimpel, Brian Mathason, Shantanu Gupta, and Mark Storm "Highly-efficient, high-energy pulse-burst Yb-doped fiber laser with transform limited linewidth", Proc. SPIE 9081, Laser Technology for Defense and Security X, 908112 (9 June 2014);

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