An outstanding challenge for deployable quantum technologies is high-resolution laser spectroscopy at the specific wavelengths of ultranarrow transitions in atomic and solid-state quantum systems. Here we demonstrate a highly flexible approach to high-resolution spectroscopy for quantum technologies across a broad range of wavelengths, through the synergistic combination of fine-tooth electro-optic frequency combs and efficient Kerr nonlinear nanophotonics. We show that such fine-tooth combs, which provide simultaneous high spectral and temporal resolution in atomic spectroscopy, undergo coherent spectral translation with essentially no efficiency loss through third-order optical parametric oscillation (OPO) in a silicon-nitride microring. This enables nearly a million comb pump teeth, separated by a 1 kHz spacing, to be translated onto signal and idler beams that can be located across a broad range of wavelengths in the visible and short near-infrared. The generated wavelengths are subject to OPO phase and frequency-matching conditions that are highly controllable through nanophotonic dispersion engineering, and in the current implementation span between 589 and 1,150 nm, with both the electro-optic comb generation process and its spectral translation not introducing appreciable broadening to the pump laser linewidth. We further demonstrate the application of this approach to quantum systems by performing sub-Doppler spectroscopy of the hyperfine transitions of Cs atomic vapour with our electro-optically driven Kerr nonlinear light source. The generality, robustness and agility of our approach, as well as its compatibility with photonic integration, are expected to lead to its widespread applications in areas such as quantum sensing, telecommunications and atomic clocks.

可部署量子技术面临的一个突出挑战是在原子和固态量子系统中超窄跃迁的特定波长下进行高分辨率激光光谱学。在这里，我们展示了一种高度灵活的高分辨率光谱方法，通过细齿电光频率梳和高效的 Kerr 非线性纳米光子学的协同组合，在广泛的波长范围内为量子技术提供高分辨光谱。我们表明，这种在原子光谱学中同时提供高光谱和时间分辨率的细齿梳子通过氮化硅微环中的三阶光学参量振荡 （OPO） 进行相干光谱平移，基本上没有效率损失。这使得近 100 万个梳状泵齿（间隔为 1 kHz）能够被转换到信号和惰轮光束上，这些光束可以定位在可见光和短近红外的广泛波长范围内。产生的波长受 OPO 相位和频率匹配条件的影响，这些条件可以通过纳米光子色散工程高度控制，并且在目前的实现跨度在 589 到 1,150 nm 之间，电光梳的产生过程及其光谱平移都不会引入明显的泵浦激光线宽展宽。我们通过使用电光驱动的 Kerr 非线性光源对 Cs 原子蒸气的超精细跃迁进行亚多普勒光谱分析，进一步展示了这种方法在量子系统中的应用。 我们方法的通用性、稳健性和敏捷性，以及它与光子集成的兼容性，有望使其在量子传感、电信和原子钟等领域得到广泛应用。