title: Multi-gigahertz frequency comb-based interferometry using frequency-variable supercontinuum generated by optical pulse synthesizer.
abstract: A multi-gigahertz frequency comb (MGFC)-based interferometer was developed for profilometry and tomography using a frequency variable supercontinuum (SC). The comparatively flattened and broadened SC light source with variable multi-gigahertz interval frequency was developed using an optical pulse synthesizer and highly nonlinear dispersion flattened fiber. The generated SC provided a stable interference output with a full width half maximum of 19 μm during interval frequency sweeping of over 400 MHz. We experimentally confirmed that the interference signal exhibited an envelope-only waveform without fringes, which enabled the drastic reduction of the sampling points resulting in high speed measurement. A full-field 3-D image with 320 × 256 × 300 pixels was acquired with a measurement time of only 10 seconds. It was demonstrated that the MGFC-based interferometer with the novel SC light source has the potential for application in a high speed full-field 3-D metrology.
authors.affiliation: Faculty of Engineering, Niigata University, 8050 Ikarashi 2, Niigata-shi, Japan. schoi@eng.niigata-u.ac.jp
authors.forename: Samuel
authors.initials: S
authors.lastname: Choi
authors.forename: Ken
authors.initials: K
authors.lastname: Kasiwagi
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Kasuya
authors.forename: Shuto
authors.initials: S
authors.lastname: Kojima
authors.forename: Tatsutoshi
authors.initials: T
authors.lastname: Shioda
authors.forename: Takashi
authors.initials: T
authors.lastname: Kurokawa
mesh_terms: D004867:Equipment Design; D007368:Interferometry / Q000295:instrumentation / Q000379:methods*; D007834:Lasers; D008027:Light; D008962:Models, Theoretical; D055095:Optics and Photonics / Q000295:instrumentation / Q000379:methods*; D014054:Tomography / Q000295:instrumentation / Q000379:methods*; D041623:Tomography, Optical Coherence / Q000295:instrumentation / Q000379:methods*