A frequency-modulated quantum-cascade laser for spectroscopy of CH4 and N2O isotopomers |
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Authors: | Gagliardi Gianluca Borri Simone Tamassia Filippo Capasso Federico Gmachl Claire Sivco Deborah L Baillargeon James N Hutchinson Albert L Cho Alfred Y |
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Institution: | Istituto Nazionale di Ottica Applicata, Comprensorio A.Olivetti, Via Campi Flegrei 34, 80078, Pozzuoli Naples, Italy. gagliardi@inoa.it |
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Abstract: | We report the development of a novel laser spectrometer for high-sensitivity detection of methane and nitrous oxide. The system relies on a quantum-cascade laser source emitting wavelength of around 8.06 microm, where strong fundamental absorption bands occur for the considered species and their isotopomers. The detection technique is based on audio-frequency and radio-frequency modulation of laser radiation. First experimental tests have been performed to estimate the achievable detection limits and the signal reproducibility levels in view of possible measurements of (13)C/(12)C, (18)O/(16)O, (17)O/(16)O and (15)N/(14)N isotope ratios. |
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