Porer Michael, Ménard Jean-Michel, Huber Rupert
Opt Lett. 2014 Apr 15;39(8):2435-8. doi: 10.1364/OL.39.002435.
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.
在超宽带太赫兹电光采样（EOS）中，对门脉冲进行光谱滤波可以显著降低量子噪声，而信号电平仅受到微弱影响。我们在AgGaS2中使用12飞秒近红外门脉冲对以45太赫兹为中心的场瞬态进行相位匹配电光检测，对这一概念进行了测试。与标准EOS相比，我们的新方法将实验信噪比提高了3倍。在某些条件下，我们的理论分析预测改善因子大于5。
