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- W1997510178 abstract "The amplified Stokes beam's mode structure in the Raman amplifier, which comes from the interplay of gain guiding and index guiding, is studied both numerically and experimentally in this paper. Theoretical results predict that gain and index guiding will lead to a narrower amplified Stokes beam of higher output energy when the input Stokes signal is detuned to the blue side of the Raman resonance. In addition, the results show that the coupling strength of an input Stokes beam into the Raman amplifier is related to the spatial overlap of the input Stokes mode with the mode supported by the Raman amplifier. Overall there is a competition between diffraction and the nonlinear effects of gain and index guiding. Theoretical calculations predict that the coupling of the Gaussian input signal mode into the amplifier is optimized by shifting the focus of the input signal towards the entrance to the Raman amplifier, shortening the Rayleigh range on the input signal with respect to the pump beam, and detuning the input signal to the blue side of the Raman resonance, all of which are contrary to the common usage of the Raman amplifier. A discussion of these phenomena in terms of a nonorthogonal mode description of the amplifier is given." @default.
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- W1997510178 date "1997-07-01" @default.
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- W1997510178 title "Influence of gain and index guiding on the mode structure and performance of a Raman amplifier" @default.
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- W1997510178 doi "https://doi.org/10.1103/physreva.56.859" @default.
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