论文标题
通过分子旋转光谱纪律的毫米波的光子生成
Photonic Generation of Millimeter-Waves Disciplined by Molecular Rotational Spectroscopy
论文作者
论文摘要
通过在Uni-Traveling-Crarrier光电二极管（UTC-PD）上的两个二极管激光器的光学杂作（UTC-PD），使毫米波的光学生成成为可能。我们利用这种技术来生产具有理想相位噪声特征的MM波振荡器，该振荡器是从一对窄线二极管激光器继承的。我们介绍了振荡器的长期稳定，通过将其引用到气态一氧化二氮（N2O）的旋转过渡来实现。直接频率调制光谱在301.442 GHz（j = 11）下产生了一个误差信号，该信号对二极管激光器之间的频率差进行了纪律，因此将毫米波辐射锁定到分子旋转线上。使用电磁（EO）梳子将MM波频率向下转换，并由参考Rubidium（RB）时钟的频率计数器记录。这导致短期分数频率稳定性为$ 1.5 \ times 10^{ - 11}/\sqrtτ$，在10,000 s平均时间为$ 4 \ times 10^{ - 12} $的长期稳定性。
Optical generation of millimeter-waves (mm-wave) is made possible by an optical heterodyne of two diode lasers on a uni-traveling-carrier photodiode (UTC-PD). We utilized this technique to produce a mm-wave oscillator with desirable phase-noise characteristics, which were inherited from a pair of narrow-linewidth diode lasers. We present the long-term stabilization of our oscillator, achieved by referencing it to a rotational transition of gaseous nitrous oxide (N2O). Direct frequency modulation spectroscopy at 301.442 GHz (J=11) generated an error signal that disciplined the frequency difference between the diode lasers and thus, locked the millimeter-wave radiation to the molecular rotational line. The mm-wave frequency was down-converted using an electro-optic (EO) comb, and recorded by a frequency counter referenced to a Rubidium (Rb) clock. This resulted in short-term fractional frequency stability of $1.5 \times 10^{-11}/\sqrtτ$ and a long term-stability of $4\times 10^{-12}$ at 10,000 s averaging time.
