Ultra-broadband dual-comb spectroscopy across 1.0–1.9 µm. (14th July 2015)

• Record Type: Journal Article
• Authors: Okubo, Sho; Iwakuni, Kana; Inaba, Hajime; Hosaka, Kazumoto; Onae, Atsushi; Sasada, Hiroyuki; Hong, Feng-Lei
• Is Part Of: Applied physics express. Volume 8:Number 8(2015:Aug.)
• Publication Date: 2015-07-14
• Subjects: Physics -- Periodicals; Technology -- Periodicals; 621.05
• DOI: 10.7567/APEX.8.082402
• Languages: English
• ISSNs: 1882-0778

Abstract

Abstract: 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 C2 H2, CH4, and H2 O at different wavelengths across the whole spectrum. The determined transition frequencies of C2 H2 agree with those from the previous sub-Doppler resolution measurement of individual lines using CW lasers within 2 MHz.