Chin. Phys. Lett.  2000, Vol. 17 Issue (4): 275-276    DOI:
Original Articles |
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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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.


Keywords: 42.81.Cn      42.65.Hw      42.50.Hz     
Published: 01 April 2000
PACS:  42.81.Cn (Fiber testing and measurement of fiber parameters)  
  42.65.Hw (Phase conjugation; photorefractive and Kerr effects)  
  42.50.Hz (Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2000/V17/I4/0275
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