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Dispersive Fourier transform based dual-comb ranging
Bing Chang1, Teng Tan1,2,3, Junting Du1
1Key Laboratory of Optical Fiber Sensing and Communications (Education Ministry of China), University of Electronic Science and Technology of China, Chengdu, 611731, China.
Nature Communications
|June 11, 2024
Summary
This study introduces a new dispersive Fourier transform (DFT) Light Detection and Ranging (LIDAR) method using dual soliton laser combs. This innovative approach achieves high-precision distance measurements and eliminates dead zones for improved LIDAR performance.
Area of Science:
- Optics and Photonics
- Metrology
- Laser Technology
Background:
- Light Detection and Ranging (LIDAR) systems are crucial for accurate spatial mapping in diverse applications.
- Advancements in optical frequency combs have significantly enhanced LIDAR precision.
- Current comb LIDAR systems face challenges in balancing speed, accuracy, and ambiguity range.
Purpose of the Study:
- To develop an innovative demodulation strategy for comb LIDAR systems.
- To improve the comprehensive performance of LIDAR by addressing inherent conflicts.
- To enable higher precision and longer non-ambiguity ranges in distance measurements.
Main Methods:
- Utilized a dispersive Fourier transform (DFT) based LIDAR method.
- Employed phase-locked Vernier dual soliton laser combs.
- Implemented in-line pulse stretching and DFT-based spectral interferometry for delay identification.
Main Results:
- Achieved absolute distance measurements with precision down to 262 nm in a single shot.
- Reached 2.8 nm precision after averaging 1.5 ms.
- Demonstrated a non-ambiguity range exceeding 1.7 km.
- Successfully eliminated dead zones in LIDAR measurements.
Conclusions:
- The DFT-based LIDAR method offers a novel approach to demodulation for comb LIDAR.
- This technique enhances measurement precision and extends the non-ambiguity range.
- The integration of frequency-resolved analysis and dual-comb ranging paves the way for future LIDAR system designs.
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