title: Acousto-Optic-Based Wavelength-Comb-Swept Laser for Extended Displacement Measurements.
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 ofR² = 0.9999 to ensure equally spaced wavelength combs in the wavenumber domain.
authors.affiliation: Department of Advanced Circuit Interconnection, Pusan National University, Busan 46241, Korea. ns.park@pusan.ac.kr.|Advanced Circuit Interconnection Division, Samsung Electro-Mechanics, Busan 46754, Korea. ns.park@pusan.ac.kr.
authors.forename: Nam Su
authors.initials: NS
authors.lastname: Park
authors.affiliation: Department of Cogno-Mechanics Engineering, Pusan National University, Busan 46241, Korea. sootnrud@pusan.ac.kr.
authors.forename: Soo Kyung
authors.initials: SK
authors.lastname: Chun
authors.affiliation: Department of Cogno-Mechanics Engineering, Pusan National University, Busan 46241, Korea. gahee@pusan.ac.kr.
authors.forename: Ga-Hee
authors.initials: GH
authors.lastname: Han
authors.affiliation: Department of Advanced Circuit Interconnection, Pusan National University, Busan 46241, Korea. ckim@pusan.ac.kr.|Department of Cogno-Mechanics Engineering, Pusan National University, Busan 46241, Korea. ckim@pusan.ac.kr.
authors.forename: Chang-Seok
authors.initials: CS
authors.lastname: Kim
keywords: Fabry-Pérot etalon filter; acousto-optic tunable filter; interferometric displacement measurement; laser and laser optics; point spread function; swept laser