Zhang Yueying, Wu Jinze, He Yanyan, Zhang Yu, Hu Yaodong, Zhang Junxiang, Zhu Shiyao
Opt Express. 2020 Jun 8;28(12):17723-17731. doi: 10.1364/OE.393032.
Nondegenerate four-wave mixing (NFWM) is a practical and effective technique for generating or amplifying light fields at different wavelengths, and could be used to create color correlation and entanglement. Here we experimentally investigate the NFWM process in diamond atomic system via two-photon excitation with two pumps at 852 nm and 921 nm, demonstrating that a seeded NFWM with a third laser at 895 nm and two self-seeded NFWMs due to amplified spontaneous emission (ASE) occur simultaneously. We compare the two kinds of processes and show that the single- and two-photon detunings hold the key role in distinguishing them. As a result, the enhancement of seeded NFWM is obtained by selecting large one- and two-photon detunings, in which case the ASE induced self-seeded NFWM can be largely suppressed. In contrast, the ASE and its induced NFWM are effectively achieved with one- and two-photon resonant excitations allowing for population inversion for efficient ASE.
非简并四波混频（NFWM）是一种用于产生或放大不同波长光场的实用且有效的技术，可用于创建颜色关联和纠缠。在此，我们通过使用852 nm和921 nm的两个泵浦进行双光子激发，对金刚石原子系统中的NFWM过程进行了实验研究，结果表明，在895 nm处的第三个激光产生的种子注入NFWM和由于放大自发辐射（ASE）产生的两个自种子注入NFWM同时发生。我们比较了这两种过程，并表明单光子和双光子失谐在区分它们方面起着关键作用。结果，通过选择较大的单光子和双光子失谐来增强种子注入NFWM，在这种情况下，可以大大抑制ASE诱导的自种子注入NFWM。相反，通过单光子和双光子共振激发有效地实现了ASE及其诱导的NFWM，从而实现了粒子数反转以实现高效的ASE。
