Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 24, Issue 5, Pages 353-355Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2011.2178824
Keywords
Fiber amplifier; single-frequency lasers; 2-mu m nanosecond pulses
Funding
- Air Force STTR [FA9550-10-C-0105]
- National Science Foundation Engineering Research Center for Integrated Access Networks, CIAN
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We report a high energy, high peak power, all-fiber-based single-frequency similar to 15-ns pulsed laser source at similar to 1918.4 nm in master oscillator-power amplifier configuration. The pulsed fiber laser seed was achieved by directly modulating a continuous-wave single-frequency fiber laser using an electro-optic modulator driven by an arbitrary waveform generator to pre-shape the pulses before amplification to mitigate pulse steepening and dynamic gain saturation. One piece of large (25-mu m) core, polarization-maintaining highly thulium-doped germanate glass fiber was used in the power amplifier stage to boost the energy and the peak power of the 15-ns pulses to >0.5 mJ and >33 kW without any nonlinearities.
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