title: Near-infrared broadband dual-frequency-comb spectroscopy with a resolution beyond the Fourier limit determined by the observation time window.
abstract: We performed broadband dual-frequency-comb spectroscopy in the near-infrared region with a much higher resolution than the Fourier limit by using discrete Fourier transforms and spectral interleaving. We observed the resonant spectrum of a Fabry-Perot cavity over a spectral range of 187 to 218 THz using this technique, and measured its free spectral ranges and finesses. The recorded spectrum includes cavity resonance lines with widths of about 2 MHz, which is much narrower than the resolution of 48 MHz determined by the observation time window.
authors.forename: Sho
authors.initials: S
authors.lastname: Okubo
authors.forename: Yi-Da
authors.initials: YD
authors.lastname: Hsieh
authors.forename: Hajime
authors.initials: H
authors.lastname: Inaba
authors.forename: Atsushi
authors.initials: A
authors.lastname: Onae
authors.forename: Mamoru
authors.initials: M
authors.lastname: Hashimoto
authors.forename: Takeshi
authors.initials: T
authors.lastname: Yasui