Synergistic control of the frequency and orbital angular momentum (OAM) of light offers new opportunities for the generation of spatio-temporal optical waveforms and optical metrology. However, their physical realizations are typically bulky and complex owing to challenges in creating, manipulating and detecting mutually coherent, high-dimensional OAM states. Here we achieve combined control over the frequency and the OAM of a comb structure on a photonic chip. Dissipative optical solitons are formed in a nonlinear ring microresonator and emitted owing to engraved angular gratings, with each comb line carrying a distinct OAM. The beam of such a vortex soliton microcomb manifests dynamically revolving, double-helical intensity profiles. The one-to-one correspondence between the OAM and frequencies features a high extinction ratio of over 18.5 dB, enabling precision spectroscopy of optical vortices. Our work provides an integrated solution for realizing coherent light sources that are multiplexed in the spatial and frequency domains, with the potential to establish a new approach to the generation of high-dimensional structured light.

光的频率和轨道角动量（OAM）的协同控制为时空光学波形和光学计量的生成提供了新的机会。然而，由于创建、操纵和检测相互相干的高维 OAM 状态方面的挑战，它们的物理实现通常庞大且复杂。这里我们实现了对光子芯片上梳状结构的频率和OAM的组合控制。耗散光学孤子在非线性环形微谐振器中形成，并通过雕刻的角光栅发射，每条梳线携带不同的OAM。这种涡旋孤子微梳的光束表现出动态旋转的双螺旋强度分布。 OAM 与频率之间一一对应，具有超过 18.5 dB 的高消光比，从而实现光学涡旋的精密光谱分析。我们的工作提供了一种集成解决方案，用于实现在空间和频率域中复用的相干光源，并有可能建立一种生成高维结构光的新方法。