Dual-comb mid-infrared spectroscopy with free-running oscillators and absolute optical calibration from a radio-frequency reference

作者：Kara, O.; Zhang, Z.; Gardiner, T.; Reid, D. T.^*

来源：Optics Express, 2017, 25(14): 16072-16082.

DOI：10.1364/OE.25.016072

• FREQUENCY-COMB
• PARAMETRIC OSCILLATOR
• LASER

By using free-running independent femtosecond OPOs with a repetition-rate difference of 500 Hz we demonstrate methane absorption spectroscopy with spectral coverage simultaneously spanning the methane P, Q and R branches and with a resolution of 0.5 cm(-1). Absolute optical frequency calibration with an accuracy of 0.25 cm(-1) (0.27 nm) is achieved from simultaneous repetition-rate and carrier-envelope-offset frequency measurements, without the need for any optical reference. The calibration technique allows registration and averaging of consecutively acquired dual-comb spectra, leading to a high quality and low-noise absorbance measurement in good agreement with the HITRAN database.

• 出版日期2017-7-10
• 单位华中科技大学