Department of Chemistry, The Physical and Theoretical Chemistry Laboratory, The University of Oxford, Oxford, UK.
Opt Lett. 2013 Jul 15;38(14):2475-7. doi: 10.1364/OL.38.002475.
A cw distributed feedback quantum cascade laser (DFB-QCL) coupled to a two-mirror linear optical cavity has been used to successfully demonstrate optical-feedback cavity-enhanced absorption spectroscopy (OF-CEAS) at 5.5 μm. The noise-equivalent absorption coefficient, α(min), was 2.4×10(-8) cm(-1) for 1 s averaging, limited by etalon-fringing. The temporal stability of the instrument allows NO detection down to 5 ppb in 2 s.
一个 cw 分布反馈量子级联激光器（DFB-QCL）与一个双反射镜线性光学腔耦合，已成功地在 5.5μm 处演示了光反馈腔增强吸收光谱（OF-CEAS）。在 1 秒的平均时间内，噪声等效吸收系数α（min）为 2.4×10（-8）cm（-1），受谱线展宽限制。仪器的时间稳定性允许在 2 秒内检测到低至 5ppb 的 NO。
