17 February 2010 A multi-channel phase locked fibre bundle laser
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Abstract
We report on the phase locking of a fibre bundle laser based on a single frequency oscillator coupled into four fibre amplifiers to provide a coherent beam of over 600 W. The oscillator was phase modulated to a width of up to 2 GHz to increase the threshold for stimulated Brillouin scattering and then a fraction split off and frequency shifted to form a reference beam. The oscillator output was amplified by end-pumped fibre amplifiers based on 20 μm core Yb doped fibre to provide a power of up to 260 W per channel. The beams combined to form a coherent output with phase errors of a twentieth of a wave, unaffected by the spectral broadening.
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David C. Jones, David C. Jones, Andrew J. Turner, Andrew J. Turner, Andrew M. Scott, Andrew M. Scott, Steven M. Stone, Steven M. Stone, Roy G. Clark, Roy G. Clark, Christopher Stace, Christopher Stace, Craig D. Stacey, Craig D. Stacey, } "A multi-channel phase locked fibre bundle laser", Proc. SPIE 7580, Fiber Lasers VII: Technology, Systems, and Applications, 75801V (17 February 2010); doi: 10.1117/12.847145; https://doi.org/10.1117/12.847145
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