Journal
OPTICS LETTERS
Volume 39, Issue 11, Pages 3270-3273Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.39.003270
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Funding
- Dutch STW [11830]
- EU en Province Gelderland within the GO-EFRO Gas analysis systems for quality control of agricultural products and medical diagnostics [2009-010034]
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We present a femtosecond optical parametric oscillator (OPO) containing two magnesium-doped periodically poled lithium niobate crystals in a singly resonant ring cavity, pumped by two mode-locked Yb-fiber lasers. As such, the OPO generates two idler combs (up to 220 mW), covering a wavelength range from 2.7 to 4.2 mu m, from which a mid-infrared dual-comb Fourier transform spectrometer is constructed. By detecting the heterodyning signal between the two idler beams a full broadband spectrum of a molecular gas can be observed over 250 cm(-1) within 70 mu s with a spectral resolution of 15 GHz. The absorption and dispersion spectra of acetylene and methane have been measured around 3000 cm(-1), indicating that this OPO represents an ideal broadband mid-infrared source for fast chemical sensing. (C) 2014 Optical Society of America
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