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Diode laser overtone spectroscopy: a possible atmospheric monitoring technique

机译：二极管激光泛光光谱：一种可能的大气监测技术

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Abstract: By the use of commercial AlGaAs diode lasers and short radiation path-length, frequency modulation (FM) absorption spectroscopy has been performed in the near infrared to study the overtone absorption bands of molecules interesting as environmental sensing tracers. Our measurements concern water vapor resonances around 820 nm, methane around 780 nm and 860 nm, and ammonia around 790 nm. Pressure broadening coefficients have been extracted by using different buffer gases like air, N$-2$/, He, and by varying their pressure between 10 and 760 Torr. A $chi$+2$/ fitting of the absorption line shapes has been used for this purpose by the aid of a simple fitting function. Finally an estimation of the sensitivity of the technique is made.!22
机译：摘要：通过使用商业AlGaAs二极管激光器和短辐射路径长度，已在近红外中进行了频率调制（FM）吸收光谱研究，以研究作为环境传感示踪剂的分子的泛音吸收带。我们的测量涉及大约820 nm的水蒸气共振，大约780 nm和860 nm的甲烷以及大约790 nm的氨气。通过使用不同的缓冲气体（如空气，N $ -2 $ / He）并在10至760 Torr之间改变压力，可以提取压力扩展系数。为此，借助于简单的拟合函数，已将吸收线形状进行$ 2 + /拟合。最后，估算了该技术的敏感性。22

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