Microresonator soliton dual-comb imaging

TL;DR

This paper demonstrates a high-speed imaging method using microresonator-generated optical frequency combs and dual-comb spectroscopy, achieving rapid imaging of dynamic scenes with high frame rates and fillrates.

Contribution

It introduces a novel dual-comb imaging technique utilizing microresonator combs for fast, high-resolution imaging without array detectors.

Findings

Imaging frame rate up to 200 kHz

Fillrates as high as 48 MegaPixels/s

Successful monitoring of microparticle flow

Abstract

Fast-responding detector arrays are commonly used for imaging rapidly-changing scenes. Besides array detectors, a single-pixel detector combined with a broadband optical spectrum can also be used for rapid imaging by mapping the spectrum into a spatial coordinate grid and then rapidly measuring the spectrum. Here, optical frequency combs generated from high-$Q$ silica microresonators are used to implement this method. The microcomb is dispersed in two spatial dimensions to measure a test target. The target-encoded spectrum is then measured by multi-heterodyne beating with another microcomb having a slightly different repetition rate, enabling an imaging frame rate up to 200 kHz and fillrates as high as 48 MegaPixels/s. The system is used to monitor the flow of microparticles in a fluid cell. Microcombs in combination with a monolithic waveguide grating array imager could greatly magnify these results by combining the spatial parallelism of detector arrays with spectral parallelism of optics.