Calibration of reference interferometer for FMCW ladar based on frequency comb

Chunbo Zhao; Tengfei Wu; Jibo Han; Lei Zhang

doi:10.1117/12.2579503

5 November 2020 Calibration of reference interferometer for FMCW ladar based on frequency comb

Chunbo Zhao, Tengfei Wu, Jibo Han, Lei Zhang

Proceedings Volume 11567, AOPC 2020: Optical Sensing and Imaging Technology; 115671S (2020) https://doi.org/10.1117/12.2579503
Event: Applied Optics and Photonics China (AOPC 2020), 2020, Beijing, China

Abstract

In frequency-modulated continuous-wave (FMCW) ladar, researchers usually linearize the output of the ladar’s tunable laser by a reference interferometer for high-accuracy measurement, but the reference interferometer need to be precisely calibrated. The H¹³C¹⁴N cell is a universal tool to complete the calibration. Here, we use the optical frequency comb instead of the traditional HCN gas cell to calibrate the path-length difference of the reference interferometer for higher precision. In this article, we present a detailed introduction of the experiment for path-length difference measurement and data processing method. The finally experimental results show that this method can give a micron precision, the standard deviation is 2.560e-5.

Citation Download Citation

Chunbo Zhao, Tengfei Wu, Jibo Han, and Lei Zhang "Calibration of reference interferometer for FMCW ladar based on frequency comb", Proc. SPIE 11567, AOPC 2020: Optical Sensing and Imaging Technology, 115671S (5 November 2020); https://doi.org/10.1117/12.2579503

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