High-accuracy long distance measurementsnwith a mode-filtered frequency comb

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F17%3A00483524" target="_blank" >RIV/68081731:_____/17:00483524 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1364/OE.25.032570" target="_blank" >http://dx.doi.org/10.1364/OE.25.032570</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1364/OE.25.032570" target="_blank" >10.1364/OE.25.032570</a>

Result language

angličtina

Original language name

High-accuracy long distance measurementsnwith a mode-filtered frequency comb

Original language description

Homodyne interferometry with a frequency comb as multi-wavelength source is anpowerful method to measure long distances with high accuracy. The measurement principlenrequires that individual comb modes are spectrally resolved, making hundreds or thousands ofnaccurately known wavelengths available for interferometry. For this reason the method cannot be applied directly to frequency combs with a low repetition rate (e.g. 100 MHz), since the modes are too close to be resolved. In this paper we use cavity mode filtering to increasing the pulse repetition rate of a comb and we apply the filtered comb for mode-resolved absolute distance measurement. Mode-filtering takes place with a single Fabry-Pérot cavity in a Verniernconfiguration, allowing to set mode spacings ranging from 10s of GHz to more than 100 GHz. Large mode-spacings significantly reduce the requirements on the resolution of the spectrometer. We demonstrate absolute long distance measurement with a mode-filtered frequency comb usingna simple array spectrometer for mode-resolved detection. Here a 1 GHz comb is used, that is converted into a 56 GHz comb by mode-filtering. A trade-off between non-ambiguity range and spectral resolution needs to be made when choosing a filter ratio. The pulse-to-pulse distancenafter filtering is 5.3 mm in this case, so to overcome ambiguity a rough measurement with an accuracy of about 2.5 mm is required. We show that in comparison to a conventional counting interferometer an agreement within 0.5 .pí.m for distances up to 50 m is found. The presentednmethod may enable the field application of low-repetition rate frequency comb lasers, like fiber lasers, for multi-wavelength homodyne interferometry. It relaxes the requirements on the spectral resolution, allowing for simple grating spectrometers as detector.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10306 - Optics (including laser optics and quantum optics)

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Optics Express

ISSN

1094-4087

e-ISSN

—

Volume of the periodical

25

Issue of the periodical within the volume

26

Country of publishing house

US - UNITED STATES

Number of pages

11

Pages from-to

32570-32580

UT code for WoS article

000418893200034

EID of the result in the Scopus database

2-s2.0-85039056793