Abstract
High energy pulsed fiber sources have numerous applications, such as range-finding, remote sensing and coherent Lidar systems. However, optical damage and nonlinear effects limit the output peak power of standard single mode fibers. To overcome these limitations, an original approach is the use of large core diameter multimode (MM) fiber to extract high energy. In order to convert the MM beam into a single mode (SM) beam, we can take advantage of non linear beam reshaping techniques such as stimulated Brillouin scattering (SBS) in multimode fibers [1], However, the spectral linewidth of the generated Stokes beam may be broadened during the process owing to the Brillouin gain bandwidth. This broadening can be a limitation for coherent Lidar systems. In this paper, we propose a new seeded SBS beam cleanup scheme to convert the aberrated output of a pulsed multimode fiber MOPA while maintaining the spectral width of the master oscillator.
© 2007 IEEE
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