An ultrafast ranging method using optical frequency comb and dispersive Fourier transformation

Li Chen; Zhehai Zhou; Guangwei Chen; Zhiyong Zhang; Ying Qin; Yue Zhao; Xiang Zhang; Guoqing Hu

doi:10.1117/12.3035722

20 November 2024 An ultrafast ranging method using optical frequency comb and dispersive Fourier transformation

Li Chen, Zhehai Zhou, Guangwei Chen, Zhiyong Zhang, Ying Qin, Yue Zhao, Xiang Zhang, Guoqing Hu

Proceedings Volume 13241, Optical Metrology and Inspection for Industrial Applications XI; 132410O (2024) https://doi.org/10.1117/12.3035722
Event: SPIE/COS Photonics Asia, 2024, Nantong, Jiangsu, China

Abstract

A dispersive Fourier transformation-based ranging method utilizing a femtosecond laser frequency comb is demonstrated. The target and measurement signals interfere through a Mach-Zehnder interferometer and then enter a single-mode fiber with a sufficiently large group velocity dispersion (GVD) to be stretched and extended. The spectral interference information is mapped to the time-domain waveform. The time-frequency conversion function, obtained through calibration, converts the time-domain data into the frequency-domain data. After applying a Fourier transform, the measured distance is determined using the peak-interval method. In multiple measurements with an interval of 200 μm, the average error is within tens of microns., which can be further reduced with a higher-precision displacement table.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Li Chen, Zhehai Zhou, Guangwei Chen, Zhiyong Zhang, Ying Qin, Yue Zhao, Xiang Zhang, and Guoqing Hu "An ultrafast ranging method using optical frequency comb and dispersive Fourier transformation", Proc. SPIE 13241, Optical Metrology and Inspection for Industrial Applications XI, 132410O (20 November 2024); https://doi.org/10.1117/12.3035722

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KEYWORDS

Ultrafast phenomena

Frequency combs

Distance measurement

Optical interferometry

Dispersion

Photodetectors

Pulse signals

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