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Solitary Pulse Generation by Backward Raman Scattering in H-2-Filled Photonic Crystal Fibers

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Abdolvand,  A.
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Nazarkin,  A.
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Chugreev,  A. V.
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Kaminski,  C. F.
Max Planck Research Group, Max Planck Institute for the Science of Light, Max Planck Society;

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Russell,  P. St. J.
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Abdolvand, A., Nazarkin, A., Chugreev, A. V., Kaminski, C. F., & Russell, P. S. J. (2009). Solitary Pulse Generation by Backward Raman Scattering in H-2-Filled Photonic Crystal Fibers. PHYSICAL REVIEW LETTERS, 103(18): 183902. doi:10.1103/PhysRevLett.103.183902.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-6BA1-5
Abstract
Using a hydrogen-filled hollow-core photonic crystal fiber as a nonlinear optical gas cell, we study amplification of ns-laser pulses by backward rotational Raman scattering. We find that the amplification process has two characteristic stages. Initially, the pulse energy grows and its duration shortens due to gain saturation at the trailing edge of the pulse. This phase is followed by formation of a symmetric pulse with a duration significantly shorter than the phase relaxation time of the Raman transition. Stabilization of the Stokes pulse profile to a solitonlike hyperbolic secant shape occurs as a result of nonlinear amplification at its front edge and nonlinear absorption at its trailing edge (caused by energy conversion back to the pump field), leading to a reshaped pulse envelope that travels at superluminal velocity.