Eliminating nonlinear phase mismatch in resonantly enhanced 4-wave mixing

Details Eliminating nonlinear phase mismatch in resonantly enhanced 4-wave mixing Eliminating nonlinear phase mismatch in resonantly enhanced 4-wave mixing

2002-05-31

arxiv.org/abs/quant-ph/0205194v1

Physics

Quantum Physics

3 pages, 3 figures

Scientific paper

10.1016/S0030-4018(02)02013-8

Resonantly enhanced four wave mixing in double-Lambda systems is limited by ac-Stark induced nonlinear phase shifts. With counter-propagating pump fields the intensity-phase coupling has minimal impact on the dynamics, but it is of critical importance for co-propagation. The nonlinear phase terms lead to an increase of the conversion length linearly proportional to the inverse seed intensity, while without nonlinear phase-mismatch the scaling is only logarithmic. We here show that the ac-Stark contributions can be eliminated while retaining the four-wave mixing contribution by choosing a suitable five level system with appropriate detunings.

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