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Recently remarkable progress has been made in the development of Raman fiber lasers (RFL's), pumped by Nd or Yb double clad fiber lasers. RFL's based on GeO2-doped silica fiber permit file efficient light generation up to a wavelength of 1.48 µm[1]. However, germanosilicate fibers have a small Stokes frequency shift of ~ 440 cm–1. This leads to the large number of Raman frequency conversion cascades and, as a consequence, to the complexity, high cost and reduced conversion efficiency of such Raman fiber lasers.
© 2000 IEEE
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