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Sensors 2017, 17(4), 740; doi:10.3390/s17040740

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

1
Department of Advanced Circuit Interconnection, Pusan National University, Busan 46241, Korea
2
Department of Cogno-Mechanics Engineering, Pusan National University, Busan 46241, Korea
3
Advanced Circuit Interconnection Division, Samsung Electro-Mechanics, Busan 46754, Korea
*
Author to whom correspondence should be addressed.
Received: 7 February 2017 / Revised: 27 March 2017 / Accepted: 28 March 2017 / Published: 31 March 2017
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Abstract

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 R2 = 0.9999 to ensure equally spaced wavelength combs in the wavenumber domain. View Full-Text
Keywords: laser and laser optics; swept laser; acousto-optic tunable filter; Fabry-Pérot etalon filter; point spread function; interferometric displacement measurement laser and laser optics; swept laser; acousto-optic tunable filter; Fabry-Pérot etalon filter; point spread function; interferometric displacement measurement
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Park, N.S.; Chun, S.K.; Han, G.-H.; Kim, C.-S. Acousto-Optic–Based Wavelength-Comb-Swept Laser for Extended Displacement Measurements. Sensors 2017, 17, 740.

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