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Applied Sciences
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Laser Frequency Combs for Absolute Distance Measurements
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Laser Frequency Combs for Absolute Distance Measurements

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Optics and Lasers".

Deadline for manuscript submissions: closed (31 March 2019) | Viewed by 3002

Special Issue Editor

Prof. Dr. Seung-Woo Kim

E-Mail Website
Guest Editor
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
Interests: precision engineering; optical metrology; optical frequency comb
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues:

In the last decade, remarkable progress has been made in laser frequency comb technology by making use of crystals or fiber type mode-locking oscillators, electro-optic modulators, and micro-cavities. These laser frequency combs are being employed for diverse investigations to advance frequency metrology and spectroscopy. In this Special Issue, focus is given to absolute distance measurements, for which laser frequency combs are offering new possibilities beyond the capabilities of traditional light sources. In this respect, quite a few advanced techniques have been demonstrated with the common aim to achieve sub-wavelength precision in long-distance ranging by taking the advantage of unique time and/or frequency domain characteristics of laser frequency combs. Examples include radio-frequency synthetic wavelength interferometry, pulse-to-pulse cross-correlation interferometry, dispersive spectral comb interferometry, dual-comb multi-heterodyne interferometry, multi-wavelength interferometry and time-of-flight measurement using nonlinear optical cross-correlation.

The present Special Issue is intended to compile a collection of articles reporting both concise reviews of recently obtained results, and new findings produced in this research area of absolute distance measurements. The topics are not limited strictly to measurement principles, but are assumed to address related applications in diverse fields, such as geodesy, machines design, space engineering and opto-mechatronics.

Prof. Dr. Seung-Woo Kim
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • laser frequency combs
  • absolute distance measurements
  • comb interferometry
  • time-of-flight of ultrashort light pulses
  • ultrashort pulse lasers

Published Papers (1 paper)

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Research

11 pages, 494 KiB  
Article
Reduction of Moving Target Time-of-Flight Measurement Uncertainty in Femtosecond Laser Ranging by Singular Spectrum Analysis Based Filtering
by Hui Cao, Youjian Song, Yuepeng Li, Runmin Li, Haosen Shi, Jiahe Yu, Minglie Hu and Chingyue Wang
Appl. Sci. 2018, 8(9), 1625; https://doi.org/10.3390/app8091625 - 12 Sep 2018
Cited by 6 | Viewed by 2719
Abstract
Femtosecond laser ranging has drawn great interest in recent years, particularly based on an asynchronous optical sampling implementation where a pair of femtosecond lasers are used. High precision absolute ranging either relies on tightly-phase-locked optical frequency combs (a dual-comb setup) or multiple averaging [...] Read more.
Femtosecond laser ranging has drawn great interest in recent years, particularly based on an asynchronous optical sampling implementation where a pair of femtosecond lasers are used. High precision absolute ranging either relies on tightly-phase-locked optical frequency combs (a dual-comb setup) or multiple averaging of the measurements from two free-running femtosecond lasers. The former technique is too complicated for practical applications, while the latter technique does not apply to moving targets. In this report, we propose a new route to utilizing a powerful singular spectrum analysis (SSA) filtering method to improve femtosecond laser ranging precision for moving targets with acceleration. The SSA method is capable of separating complex patterns in signals without a priori knowledge of the dynamical model. Here, we utilize the basic SSA filter to extract the target trajectory in the presence of measurement noise both in numerical simulation and in the absolute ranging experiment based on a pair of free-running femtosecond lasers. The experimentally-achieved absolute ranging uncertainty of a moving target is well below 110 nm at a 200-Hz update rate by applying the basic SSA filter. This method paves the way to the practical applications of femtosecond absolute ranging for dynamic objects. Full article
(This article belongs to the Special Issue Laser Frequency Combs for Absolute Distance Measurements)
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