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Nondegenerate Four Wave Mixing in Rare-Earth Doped Fiber Under the Influence of Coherent Population Trapping |
GUO Yang1,2;MING Hai1,2;LIU Fang-Xin3;XU Li-Xin1,2 |
1Structure Research Laboratory, 2Department of Physics, 3Department of Astronomy and Applied Physics, University of Science and Technology of China, Hefei 230026
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Cite this article: |
GUO Yang, MING Hai, LIU Fang-Xin et al 2000 Chin. Phys. Lett. 17 275-276 |
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Abstract By applying a strong coupling field between a lower state and the upper state of an allowed transition to ground, an enhancement of nondegenerate four wave mixing (NDFWM) with a resonantly enhanced third-order nonlinear susceptibility in a rare-earth doped fiber can be obtained. We have derived an expression for the third-order non-linear susceptibility using quantum theory and discussed the conversion efficiency for NDFWM. The theoretical result shows that the conversion efficiency has a maximum value while the third-order nonlinear susceptibility shows constructive interference at the Rabi frequency Ω23 =±√Г2Г3. On account of phase-mismatch, the frequency conversion efficiency has a maximum value over a certain small range of frequency separation (such as 0 < Δf < 30 GHz at the wavelength λc = 1.55 μm), and the frequency conversion range increases with increase of the third-order nonlinear susceptibility.
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Keywords:
42.81.Cn
42.65.Hw
42.50.Hz
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Published: 01 April 2000
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PACS: |
42.81.Cn
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(Fiber testing and measurement of fiber parameters)
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42.65.Hw
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(Phase conjugation; photorefractive and Kerr effects)
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42.50.Hz
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(Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)
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