Open AccessAbsolute distance measurement with a gain-switched dual optical frequency comb
Author(s) -
Kefei Hei,
Kaszubowska Anandarajah,
Eamonn P. Martin,
Guang Shi,
Prince M. Anandarajah,
Nandini Bhattacharya
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.413478
Subject(s) - optics , interferometry , frequency comb , physics , distance measurement , laser , optical frequency comb , computer science , artificial intelligence
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.