Absolute distance measurement with a gain-switched dual optical frequency comb

Journal article (2021)

Authors

K. Hei ImPhys/Medical Imaging - AS
Kaszubowska Anandarajah Trinity College Dublin
Eamonn P. Martin Dublin City University
Guang Shi Hangzhou Dianzi University
Prince M. Anandarajah Dublin City University
N. Bhattacharya Optical Technologies - Mechanical, Maritime and Materials Engineering
Research Group
ImPhys/Medical Imaging (AS) (TU Delft)
Copyright: © 2021 K. Hei, Kaszubowska Anandarajah, Eamonn P. Martin, Guang Shi, Prince M. Anandarajah, N. Bhattacharya
DOI: https://doi.org/10.1364/OE.413478
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Published Date

2021

Language

English

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Faculty

Applied Sciences

Department

ImPhys/Imaging Physics

Research Group

ImPhys/Medical Imaging

Abstract

The measurement of distance plays an important role in many aspects of modern societies. In this paper, an absolute distance measurement method for arbitrary distance is proposed and demonstrated using mode-resolved spectral interferometry with a gain-switched dual comb. An accuracy of 12 µm, when compared to a He-Ne fringe counting laser interferometer, for a displacement up to 2.5 m is demonstrated by tuning the repetition frequency of the dual comb from 1.1 GHz to 1.4 GHz. The compact measurement system based on a gain-switched dual comb breaks the constraint of periodic ambiguity. The simplification and improvements are significant for further industrial applications.

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