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Mid-infrared cavity leak-out spectroscopy for ultrasensitive detection of carbonyl sulfide

机译:中红外腔泄漏光谱法,用于超灵敏地检测硫化羰

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We present a ringdown absorption spectrometer based on a continuous-wave CO laser in the mid-infrared spectral region near lambda = 5 mu m. Using a linear ringdown cavity (length, 0.5 m) with R > = 99.99% mirrors, we observed a noise-equivalent absorption coefficient of 7 X 10(-11) cm(-1) Hz(-1/2). This is 2 orders of magnitude improved compared with previous values. With this setup we studied the spectroscopic detection of carbonyl sulfide (here abbreviated OCS) traces in ambient air and in exhaled breath. We achieved a detection limit of 7 parts in 10(12) (parts per trillion) OCS in ambient air, which is unprecedented and shows great promise for environmental and biomedical applications. (c) 2005 Optical Society of America.
机译:我们提出了一种基于连续波CO激光器的lambdown吸收光谱仪,该激光器在λ= 5μm附近的中红外光谱区域中。使用R> = 99.99%的镜子的线性衰荡腔(长度为0.5 m),我们观察到等效噪声吸收系数为7 X 10(-11)cm(-1)Hz(-1/2)。与以前的值相比,这提高了2个数量级。通过这种设置,我们研究了环境空气和呼出气中羰基硫(此处简称为OCS)的光谱检测方法。我们在环境空气中的10(12)OCS中的检出限为7(十分之一)(十亿分之一),这是前所未有的,对环境和生物医学应用显示出巨大的希望。 (c)2005年美国眼镜学会。

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