Shot noise reduced terahertz detection via spectrally postfiltered electro-optic sampling
Shot noise reduced terahertz detection via spectrally postfiltered electro-optic sampling
复制标题
DOI：
10.1364/ol.39.002435
复制
发表时间：
2014-04-15
期刊：
影响因子：
3.6
通讯作者：
Huber, Rupert
中科院分区：
文献类型：
--
作者：
Porer, Michael;Menard, Jean-Michel;Huber, Rupert
在超宽带太赫兹电光采样(EOS)中，对门脉冲进行频谱滤波可以很好地抑制量子噪声，而对信号电平的影响很小。这一概念已经在AgGaS2中进行了相位匹配电光探测，探测中心频率为45THz、近红外门脉冲为12fS的场强瞬变。与标准状态方程相比，我们的新方法将实验信噪比提高了3倍。理论分析表明，在一定条件下，改善因子将大于5。(C)2014年美国光学学会
In ultrabroadband terahertz electro-optic sampling (EOS), spectral filtering of the gate pulse can strongly reduce the quantum noise while the signal level is only weakly affected. The concept is tested for phase-matched electro-optic detection of field transients centered at 45 THz with 12 fs near-infrared gate pulses in AgGaS2. Our new approach increases the experimental signal-to-noise ratio by a factor of 3 compared to standard EOS. Under certain conditions an improvement factor larger than 5 is predicted by our theoretical analysis. (C) 2014 Optical Society of America