Wan Chenchen, Li Peng, Ruehl Axel, Hartl Ingmar
Opt Lett. 2018 Mar 1;43(5):1059-1062. doi: 10.1364/OL.43.001059.
Synchronously pumped optical parametric oscillators (OPOs) are important tools for frequency comb (FC) generation in the mid-IR spectral range, where few suitable laser gain materials exist. For degenerate OPOs, self-phase-locking to the pump FC has been demonstrated. Here, we present a phase noise study of the carrier envelope offset frequency, revealing a -6 dB reduction compared to the pump FC over a wide Fourier frequency range. These results demonstrate that a degenerate OPO can be an ideal coherent frequency divider without any excess noise.
同步泵浦光学参量振荡器（OPO）是在中红外光谱范围内产生频率梳（FC）的重要工具，而该光谱范围内合适的激光增益材料很少。对于简并OPO，已经证明其能够自相位锁定到泵浦频率梳。在此，我们展示了对载波包络偏移频率的相位噪声研究，结果表明在很宽的傅里叶频率范围内，相较于泵浦频率梳，其相位噪声降低了6分贝。这些结果表明，简并OPO可以成为一种理想的相干分频器，且不会产生任何额外噪声。
