Abstract
Dual-comb spectroscopy has recently attracted attention as an excellent spectroscopic application of optical
frequency combs (optical combs). This article introduces an application of dual-comb spectroscopy
to in-plane angle measurement. We extended dual-comb technology to the spatiotemporal dimension by
combining it with an optical vortex, developed a dual-optical-vortex comb spectroscopy method, and
demonstrated angle measurement for the first time. The result shows the great potential of optical combs
for new technological development based on the spatiotemporal coherent controllability of light waves.
