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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

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Doppler Lidar Based on Mode-Locked Semiconductor Lasers.

Yibing Chen¹, Mengxi Zhou¹, Wenxuan Ma¹

¹College of Electronic and Optical Engineering and College of Flexible Electronics (Future Technology), Nanjing University of Posts and Telecommunications, Nanjing 210023, China.

|November 27, 2025

Summary

This summary is machine-generated.

This study introduces a Doppler lidar velocimetry system using a mode-locked semiconductor laser. It achieves high-precision velocity measurements for moving objects with enhanced robustness by using multiple laser modes.

Keywords:

Doppler lidar mode-locked semiconductor laser velocity measurement velocity measurement error velocity resolution

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Area of Science:

Optical Engineering
Laser Physics
Metrology

Background:

Doppler lidar systems are crucial for remote velocity measurements.
Mode-locked semiconductor lasers (ML-SL) offer stable optical frequency combs.
Enhancing the robustness and precision of lidar velocimetry is an ongoing challenge.

Purpose of the Study:

To present a novel Doppler lidar system utilizing an ML-SL source.
To leverage multiple phase-correlated modes for improved velocimetry.
To experimentally validate the system's precision and resolution.

Main Methods:

Development of a Doppler lidar system with an ML-SL source featuring a Fabry-Pérot cavity and saturable absorber.
Utilization of multiple phase-correlated modes from the optical frequency comb.
Cross-referencing multiple Doppler shift signals to enhance system robustness.

Main Results:

Precise velocity measurements achieved for speeds ranging from 0.005 m/s to 0.5 m/s.
Maximum absolute error of 0.00064 m/s and minimum of 0.00003 m/s.
Using multiple comb teeth reduced maximum absolute error by 35% compared to single-tooth use.

Conclusions:

The developed Doppler lidar system demonstrates high precision and robustness.
The multi-mode approach significantly enhances velocimetry accuracy.
The system offers excellent velocity resolution, adaptable through frequency resolution adjustments.