Continuous-streaming high-speed two-photon dual-comb LiDAR with free-running lasers

TL;DR

This paper demonstrates a high-speed, low-data dual-comb LiDAR system using free-running lasers, achieving near-micrometer precision at 11.5 kHz for continuous distance measurement, suitable for industrial applications.

Contribution

It introduces a novel dual-comb LiDAR approach that operates continuously at high speed with unstabilized lasers, reducing data burden and enabling practical real-time distance metrology.

Findings

Achieved 11.5 kHz distance measurement rate with 1 um precision.

Demonstrated continuous streaming over four minutes capturing audio.

Utilized free-running lasers for high-speed, low-data acquisition.

Abstract

Dual-comb distance metrology combines sub-um precision with absolute distance measurement over meter-scale non-ambiguity ranges. The most common interferometric implementation requires sophisticated approaches to achieve continuous streaming due to the need for digitization at near-gigasample/s rates. Here, we exploit the naturally low data burden of two-photon dual-comb LiDAR to demonstrate continuously-streamed distance metrology at 11.5 kHz, reaching a precision of nearly 1 um in an averaging time of 10 ms. Using free-running 500 MHz Er,Yb:glass femtosecond lasers we achieve sampling rates >10 kHz, sufficient to demonstrate the capture of a four-minute audio track from the displacement of a loudspeaker-mounted mirror. The ability to perform high-speed yet low-data-burden distance metrology using unstabilized lasers presents exciting opportunities for diverse applications in industrial machine-tool control and calibration.