MW+ peak power sub-nsec 10-kHz repetition rate polarization-maintaining fiber-amplifiers using tapered Yb-doped fibers

Youming Chen; Frank Kimpel; Jean-Luc Fouron; Shantanu Gupta

doi:10.1117/12.909779

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15 February 2012 MW+ peak power sub-nsec 10-kHz repetition rate polarization-maintaining fiber-amplifiers using tapered Yb-doped fibers

Youming Chen, Frank Kimpel, Jean-Luc Fouron, Shantanu Gupta

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Proceedings Volume 8237, Fiber Lasers IX: Technology, Systems, and Applications; 82371T (2012) https://doi.org/10.1117/12.909779
Event: SPIE LASE, 2012, San Francisco, California, United States

Abstract

Novel tapered Yb-doped polarization-maintaining (PM) large-mode-area (LMA) fibers were fabricated, with 25/250μm and 40/400μm core/clad at each end, and used in the last stage of a multi-stage Yb-fiber MOPA. The fiber-MOPA is controlled by high-speed FPGA for real-time control of the seed laser diode modulation, electro-optic modulator and acousto-optic modulator. Stable 0.3nsec pulses at 10kHz rate with 0.3mJ pulse energy (1MW peak power) is demonstrated. At 1nsec pulsewidth, scaling to >0.5mJ pulse energy is demonstrated. Polarization extinction ratio of 17dB is obtained with diffraction limited beam quality and excellent (<3%) power stability. Such compact and robust pulsed fiber amplifiers enable next generation of airborne and space lidar transmitters.

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Youming Chen, Frank Kimpel, Jean-Luc Fouron, and Shantanu Gupta "MW+ peak power sub-nsec 10-kHz repetition rate polarization-maintaining fiber-amplifiers using tapered Yb-doped fibers", Proc. SPIE 8237, Fiber Lasers IX: Technology, Systems, and Applications, 82371T (15 February 2012); https://doi.org/10.1117/12.909779

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