Segmented acoustic core photonic crystal fiber laser
First Claim
1. In a standard photonic crystal fiber comprised in cross-section of N uniformly doped, hexagon-shaped silica core segments enclosed by a cladding comprised of stress applying parts and air holes, the improvement comprising adding a plurality of non-rare earth dopants known to either raise or lower the acoustic index of refraction or the optical index of refraction or both to said N core segments selected in type and concentration such that the acoustic index of refraction of each core segment is changed to support N distinctly different peak Brillouin frequencies having no linewidth overlap while maintaining the same optical index of refraction for all N core segments, thereby enabling kilowatt-level narrow-linewidth fiber lasers and amplifiers.
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Abstract
Stimulated Brillouin scattering (SBS) in a photonic crystal fiber is suppressed by doping the individual core segments such that the Brillouin frequency of each segment is sufficiently different from the neighboring segments that Brillouin scattered light from one core segment sees negligible gain from the other core segments, whereby higher power narrow-linewidth optical fiber amplifiers and lasers may be obtained. The optical properties of the guiding medium are preserved through the careful design of the core and the lattice structure.
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Citations
3 Claims
- 1. In a standard photonic crystal fiber comprised in cross-section of N uniformly doped, hexagon-shaped silica core segments enclosed by a cladding comprised of stress applying parts and air holes, the improvement comprising adding a plurality of non-rare earth dopants known to either raise or lower the acoustic index of refraction or the optical index of refraction or both to said N core segments selected in type and concentration such that the acoustic index of refraction of each core segment is changed to support N distinctly different peak Brillouin frequencies having no linewidth overlap while maintaining the same optical index of refraction for all N core segments, thereby enabling kilowatt-level narrow-linewidth fiber lasers and amplifiers.
Specification