We report on mid-infrared gas spectroscopy measurements by means of the supercontinuum (SC) absorption spectroscopy method. We developed a 80 MHz-repetition-rate mid-infrared SC light source with an average power of 40 mW generated through nonlinear propagation of 200 fs pulses in a 10 cm-long segment of step-index tellurite fiber. A compact multipass cell is used for analyzing absorption of CO₂ and CH₄ gases and their mixture in the 2–3.5 m spectral range. Experimental results are compared to the HITRAN database.

中文翻译：

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迈向阶跃型碲酸盐纤维中红外超连续谱的吸收光谱

我们通过超连续谱（SC）吸收光谱法报告中红外气体光谱测量。我们开发了80 MHz重复频率的中红外SC光源，该光源通过在10厘米长的阶跃型碲酸盐光纤中非线性传播200 fs脉冲而产生的平均功率为40 mW。紧凑的多通道样品池用于分析2-3.5中CO ₂和CH ₄气体及其混合物的吸收米光谱范围。将实验结果与HITRAN数据库进行比较。