Mirrorless Optical Parametric Oscillation with Tunable Threshold in Cold Atoms.
Mirrorless Optical Parametric Oscillation with Tunable Threshold in Cold Atoms.
复制标题
冷原子中具有可调阈值的无镜光学参量振荡。
DOI：
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发表时间：
2017
影响因子：
8.6
通讯作者：
Shengwang Du
中科院分区：
文献类型：
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作者：
Yefeng Mei;Xianxin Guo;Luwei Zhao;Shengwang Du
报道了利用电磁感应透明在激光冷却的四波混频原子中实现阈值可调的无镜光学参量振荡器。在两束经典激光的驱动下，产生的斯托克斯和反斯托克斯光场通过非线性四波混频过程反向传播，形成有效的内反馈。这种反馈不涉及任何空腔或空间分布的微结构。我们观察到光子关联性质从双光子量子态（低于阈值）到振荡态（高于阈值）的转变。可以通过改变操作参数来调谐泵浦阈值。我们实现了阈值低至15 μW的振荡。
We report the demonstration of a mirrorless optical parametric oscillator with a tunable threshold in laser-cooled atoms with four-wave mixing (FWM) using electromagnetically induced transparency. Driven by two classical laser beams, the generated Stokes and anti-Stokes fields counterpropagate and build up efficient intrinsic feedback through the nonlinear FWM process. This feedback does not involve any cavity or spatially distributed microstructures. We observe the transition of photon correlation properties from the biphoton quantum regime (below the threshold) to the oscillation regime (above the threshold). The pump threshold can be tuned by varying the operating parameters. We achieve the oscillation with a threshold as low as 15 μW.