原子蒸气中四波混频匹配脉冲的超慢传输
Ultraslow propagation of matched pulses by four-wave mixing in an atomic vapor
摘要：
我们在热原子蒸气中非简并四波混频中观察到了匹配脉冲的超慢传输。短至70 ns的探测脉冲可以延迟高达40 ns的可调谐时间，几乎没有展宽或失真。在传播过程中，探测脉冲被放大并产生共轭脉冲，该共轭脉冲更快，并在以固定延迟锁定到探测脉冲之前与探测脉冲分离。这一过程的精确时间使我们能够确定磁化率张量的关键系数。在这个系统中的增益的存在使得这个系统在全光信息处理的上下文中非常有趣。
英文摘要：
We have observed the ultraslow propagation of matched pulses in nondegenerate four-wave mixing in a hot atomic vapor. Probe pulses as short as 70 ns can be delayed by a tunable time of up to 40 ns with little broadening or distortion. During the propagation, a probe pulse is amplified and generates a conjugate pulse which is faster and separates from the probe pulse before getting locked to it at a fixed delay. The precise timing of this process allows us to determine the key coefficients of the susceptibility tensor. The presence of gain in this system makes this system very interesting in the context of all-optical information processing.
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