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Proceedings Paper

Kilowatt high-efficiency narrow-linewidth monolithic fiber amplifier operating at 1034 nm
Author(s): Nader A. Naderi; Angel Flores; Brian M. Anderson; Ken Rowland; Iyad Dajani
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Paper Abstract

Power scaling investigation of a narrow-linewidth, Ytterbium-doped all-fiber amplifier operating at 1034 nm is presented. Nonlinear stimulated Brillouin scattering (SBS) effects were suppressed through the utilization of an external phase modulation technique. Here, the power amplifier was seeded with a spectrally broadened master oscillator and the results were compared using both pseudo-random bit sequence (PRBS) and white noise source (WNS) phase modulation formats. By utilizing an optical band pass filter as well as optimizing the length of fiber used in the pre-amplifier stages, we were able to appreciably suppress unwanted amplified spontaneous emission (ASE). Notably, through PRBS phase modulation, greater than two-fold enhancement in threshold power was achieved when compared to the WNS modulated case. Consequently, by further optimizing both the power amplifier length and PRBS pattern at a clock rate of 3.5 GHz, we demonstrated 1 kilowatt of power with a slope efficiency of 81% and an overall ASE content of less than 1%. Beam quality measurements at 1 kilowatt provided near diffraction-limited operation (M2 < 1.2) with no sign of modal instability. To the best of our knowledge, the power scaling results achieved in this work represent the highest power reported for a spectrally narrow all-fiber amplifier operating at < 1040 nm in Yb-doped silica-based fiber.

Paper Details

Date Published: 9 March 2016
PDF: 6 pages
Proc. SPIE 9728, Fiber Lasers XIII: Technology, Systems, and Applications, 972803 (9 March 2016); doi: 10.1117/12.2211803
Show Author Affiliations
Nader A. Naderi, U. S. Air Force Research Lab. (United States)
Angel Flores, U. S. Air Force Research Lab. (United States)
Brian M. Anderson, U. S. Air Force Research Lab. (United States)
Ken Rowland, U. S. Air Force Research Lab. (United States)
Iyad Dajani, U. S. Air Force Research Lab. (United States)


Published in SPIE Proceedings Vol. 9728:
Fiber Lasers XIII: Technology, Systems, and Applications
John Ballato, Editor(s)

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