Ultra-broadband dual-comb spectroscopy across 1.0-1.9 μm

Sho Okubo, Kana Iwakuni, Hajime Inaba, Kazumoto Hosaka, Atsushi Onae, Hiroyuki Sasada, Feng Lei Hong

Research output: Contribution to journalArticlepeer-review

148 Citations (Scopus)


We have carried out dual-comb spectroscopy and observed in a simultaneous acquisition a 140-THz-wide spectrum from 1.0 to 1.9 μm using two fiber-based frequency combs phase-locked to each other. This ultrabroad-wavelength bandwidth is realized by setting the difference between the repetition rates of the two combs to 7.6 Hz using the sub-Hz-linewidth fiber combs. The recorded spectrum contains five vibration-rotation bands of C2H2, CH4, and H2O at different wavelengths across the whole spectrum. The determined transition frequencies of C2H2 agree with those from the previous sub-Doppler resolution measurement of individual lines using CW lasers within 2 MHz.

Original languageEnglish
Article number082402
JournalApplied Physics Express
Issue number8
Publication statusPublished - 2015 Aug 1

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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