共振增强四波混频中非线性相位失配的消除
Eliminating nonlinear phase mismatch in resonantly enhanced 4-wave mixing
摘要：
双λ系统中共振增强的四波混频受到交流斯塔克诱导的非线性相移的限制。对于反向传播的泵浦场，强度-相位耦合对动力学的影响最小，但对于共同传播来说至关重要。非线性相位项导致转换长度的增加与种子强度的倒数成线性比例，而没有非线性相位失配，缩放仅为对数。我们在这里表明，ac-Stark贡献可以被消除，而保留四波混频的贡献，通过选择一个合适的五能级系统与适当的失谐。
英文摘要：
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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