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

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 ultra-broad 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 C${}_2$H${}_2$, CH${}_4$, and H${}_2$O at different wavelengths across the whole spectrum. The determined transition frequencies of C${}_2$H${}_2$ agree with those from the previous sub-Doppler resolution measurement of individual lines using CW lasers within 2 MHz.

13 pages, 4 figures, 1 table