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首页> 外文期刊>Chemical Physics Letters >On quantitative measurements in phase-shift off-axis cavity-enhanced absorption spectroscopy
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On quantitative measurements in phase-shift off-axis cavity-enhanced absorption spectroscopy

机译：关于相移离轴腔增强吸收光谱法中的定量测量

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The contribution of amplified spontaneous emission (ASE) from a fibre-coupled DFB near-infrared diode laser has been analysed for phase-shift off-axis cavity-enhanced absorption spectroscopy (PS-OA-CEAS). A new phasor representation of the laser coherent component and the ASE components, with both long and short ring-down times, has been proposed for calculating absorption spectra from the phase and amplitude of the cavity output intensity. The line strength of the R(4) CO2 line at 1604.7 nm has been estimated for the case when the intensity of the ASE component, passing through the cavity without long-term ringing, contributes up to similar to 60% of the total light intensity observed at the cavity output. It has been shown that neglecting the ASE contribution can lead to an overestimation of the line strength by a factor of similar to 4.8, whereas the line strength, calculated in accordance with the phasor model introduced here, is close to the actual line strength from Hitran. (C) 2007 Elsevier B.V. All rights reserved.
机译：对于相移离轴腔增强吸收光谱法（PS-OA-CEAS），已经分析了来自光纤耦合DFB近红外二极管激光器的放大自发发射（ASE）的贡献。已经提出了一种新的相干表示，即相干时间长短的激光相干分量和ASE分量，用于根据腔体输出强度的相位和幅度计算吸收光谱。 R（4）CO2线在1604.7 nm处的线强度已针对以下情况进行了估算：当ASE分量穿过腔体而没有长期振铃时，其强度达到总光强度的60％左右在型腔输出处观察到。结果表明，忽略ASE的贡献会导致线强度的高估，近似为4.8，而根据此处引入的相量模型计算出的线强度接近于Hitran的实际线强度。 。 （C）2007 Elsevier B.V.保留所有权利。

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