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Continuous adiabatic frequency conversion for FMCW-LiDAR.

Alexander Mrokon¹, Johanna Oehler², Ingo Breunig^2,3

¹Laboratory for Optical Systems, Department of Microsystems Engineering - IMTEK, University of Freiburg, Georges-Köhler-Allee 102, Freiburg, 79110, Germany. alexander.mrokon@imtek.uni-freiburg.de.

Scientific Reports

|February 29, 2024

Summary

This summary is machine-generated.

We developed electro-optically driven adiabatic frequency converters using lithium niobate microresonators. These devices enable ultrafast, linear frequency tuning for advanced applications like Frequency-Modulated Continuous Wave (FMCW) LiDAR.

Keywords:

Adiabatic frequency conversion Electro-optic effect Lithium niobate Whispering gallery resonators

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Area of Science:

Photonics and Optical Engineering
Materials Science (Lithium Niobate)
Applied Physics

Background:

Continuous frequency tuning of lasers is crucial for diverse applications, including gravitational wave detection, optical clocks, and environmental monitoring.
Existing methods face challenges in achieving broad tuning ranges (>100 GHz), sub-microsecond tuning times, linearity, and long coherence lengths (>10 m).

Purpose of the Study:

To demonstrate ultrafast and linear frequency tuning using electro-optically driven adiabatic frequency converters.
To achieve high coherence lengths for advanced optical applications.
To validate the performance of these converters in Frequency-Modulated Continuous Wave (FMCW) LiDAR systems.

Main Methods:

Fabrication of high-Q microresonators from lithium niobate.
Utilizing electro-optic modulation for adiabatic frequency conversion.
Generating frequency chirps from arbitrary voltage signals with nanosecond temporal resolution.
Characterizing linearity, tuning range, and coherence length of the generated chirps.

Main Results:

Achieved temporal resolutions below 1 µs for frequency chirps.
Generated 200-ns frequency chirps with <1% deviation from linearity.
Demonstrated coherence lengths exceeding 20 m.
Successfully applied the linear frequency sweeps in FMCW LiDAR for distance measurements (0.5–10 m).

Conclusions:

Electro-optically driven adiabatic frequency converters offer ultrafast, linear, and coherent frequency tuning.
These converters are suitable for applications demanding precise and rapid frequency modulation, such as FMCW LiDAR.
The technology leverages lithium niobate microresonators for versatile performance in advanced optical systems.