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A microcomb-empowered Fourier domain mode-locked LIDAR.

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  • 1State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instruments, Tsinghua University, Beijing 100084, China.

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Summary
This summary is machine-generated.

This study presents a novel frequency-modulated continuous wave (FMCW) Light Detection and Ranging (LIDAR) system achieving sub-10-nanometer precision and a 24.6 kHz update rate. The advanced FMCW LIDAR utilizes a Fourier Domain Mode-Locked laser and microcomb for enhanced autonomous technology performance.

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Area of Science:

  • Optics and Photonics
  • Autonomous Systems
  • Metrology

Background:

  • Frequency-modulated continuous wave (FMCW) Light Detection and Ranging (LIDAR) is crucial for autonomous technology, offering low return power operation and simultaneous distance/velocity acquisition.
  • Current FMCW LIDAR systems face challenges in achieving high update rates alongside sub-micrometer precision.

Purpose of the Study:

  • To develop an FMCW LIDAR system with enhanced precision and rapid update rates.
  • To demonstrate the application of microcombs in achieving ultrafast frequency sweeping for LIDAR.

Main Methods:

  • Integration of a broadband Fourier Domain Mode-Locked (FDML) laser with a silicon nitride soliton microcomb.
  • Utilizing a 50-gigahertz microcomb to linearize an ultrahigh-frequency chirp rate of up to 320 petahertz per second.
  • Theoretical analysis to address nonlinear frequency sweeps in FMCW velocity measurements.

Main Results:

  • Achieved sub-10-nanometer precision and a 24.6-kilohertz update rate in the FMCW LIDAR system.
  • Demonstrated velocity measurement with an uncertainty below 0.4 millimeter per second.
  • Validated the effectiveness of microcombs in enabling ultrafast frequency sweeping lasers.

Conclusions:

  • The developed FMCW LIDAR system overcomes previous limitations in precision and speed.
  • Microcombs are shown to be a key technology for advancing ultrafast frequency sweeping lasers in LIDAR applications.
  • This work paves the way for more capable autonomous systems.