Limiting efficiencies of nonlinear-optical processes in microstructure fibers |
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Authors: | M Zheltikov |
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Institution: | (1) Physics Department, International Laser Center, Moscow State University, Vorob’evy gory, Moscow, 119899, Russia |
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Abstract: | The ways of achieving limiting waveguide enhancement of nonlinear-optical processes in microstructure and photonic-crystal fibers are studied. The waveguide enhancement of nonlinear-optical processes is shown to be physically limited because of the competition of diffraction and refractive-index-step radiation confinement. In the case of the limiting refractive-index step values for fused silica fibers, the maximum waveguide enhancement of nonlinear-optical processes is achieved with submicron fiber core diameters. The maximum waveguide enhancement of coherent anti-Stokes Raman scattering in a hollow microstructure fiber relative to the regime of tight focusing is shown to scale as λ 2/αa4 with radiation wavelength λ, the inner fiber radius a, and the magnitude of radiation losses α. |
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