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Acousto-Optic–Based Wavelength-Comb-Swept Laser for Extended Displacement Measurements

We demonstrate a novel wavelength-comb-swept laser based on two intra-cavity filters: an acousto-optic tunable filter (AOTF) and a Fabry-Pérot etalon filter. The AOTF is used for the tunable selection of the output wavelength with time and the etalon filter for the narrowing of the spectral linewidt...

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Autores principales: Park, Nam Su, Chun, Soo Kyung, Han, Ga-Hee, Kim, Chang-Seok
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5421700/
https://www.ncbi.nlm.nih.gov/pubmed/28362318
http://dx.doi.org/10.3390/s17040740
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author Park, Nam Su
Chun, Soo Kyung
Han, Ga-Hee
Kim, Chang-Seok
author_facet Park, Nam Su
Chun, Soo Kyung
Han, Ga-Hee
Kim, Chang-Seok
author_sort Park, Nam Su
collection PubMed
description We demonstrate a novel wavelength-comb-swept laser based on two intra-cavity filters: an acousto-optic tunable filter (AOTF) and a Fabry-Pérot etalon filter. The AOTF is used for the tunable selection of the output wavelength with time and the etalon filter for the narrowing of the spectral linewidth to extend the coherence length. Compared to the conventional wavelength-swept laser, the acousto-optic–based wavelength-comb-swept laser (WCSL) can extend the measureable range of displacement measurements by decreasing the sensitivity roll-off of the point spread function. Because the AOTF contains no mechanical moving parts to select the output wavelength acousto-optically, the WCSL source has a high wavenumber (k) linearity of R(2) = 0.9999 to ensure equally spaced wavelength combs in the wavenumber domain.
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spelling pubmed-54217002017-05-12 Acousto-Optic–Based Wavelength-Comb-Swept Laser for Extended Displacement Measurements Park, Nam Su Chun, Soo Kyung Han, Ga-Hee Kim, Chang-Seok Sensors (Basel) Article We demonstrate a novel wavelength-comb-swept laser based on two intra-cavity filters: an acousto-optic tunable filter (AOTF) and a Fabry-Pérot etalon filter. The AOTF is used for the tunable selection of the output wavelength with time and the etalon filter for the narrowing of the spectral linewidth to extend the coherence length. Compared to the conventional wavelength-swept laser, the acousto-optic–based wavelength-comb-swept laser (WCSL) can extend the measureable range of displacement measurements by decreasing the sensitivity roll-off of the point spread function. Because the AOTF contains no mechanical moving parts to select the output wavelength acousto-optically, the WCSL source has a high wavenumber (k) linearity of R(2) = 0.9999 to ensure equally spaced wavelength combs in the wavenumber domain. MDPI 2017-03-31 /pmc/articles/PMC5421700/ /pubmed/28362318 http://dx.doi.org/10.3390/s17040740 Text en © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Park, Nam Su
Chun, Soo Kyung
Han, Ga-Hee
Kim, Chang-Seok
Acousto-Optic–Based Wavelength-Comb-Swept Laser for Extended Displacement Measurements
title Acousto-Optic–Based Wavelength-Comb-Swept Laser for Extended Displacement Measurements
title_full Acousto-Optic–Based Wavelength-Comb-Swept Laser for Extended Displacement Measurements
title_fullStr Acousto-Optic–Based Wavelength-Comb-Swept Laser for Extended Displacement Measurements
title_full_unstemmed Acousto-Optic–Based Wavelength-Comb-Swept Laser for Extended Displacement Measurements
title_short Acousto-Optic–Based Wavelength-Comb-Swept Laser for Extended Displacement Measurements
title_sort acousto-optic–based wavelength-comb-swept laser for extended displacement measurements
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5421700/
https://www.ncbi.nlm.nih.gov/pubmed/28362318
http://dx.doi.org/10.3390/s17040740
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