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Sensitive H_(2) detection by use of thermal-lens Raman spectroscopy without a tunable laser

机译:在没有可调激光器的情况下使用热透镜拉曼光谱进行灵敏的H_(2)检测

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摘要

A new nonlinear Raman spectroscopy technique for trace-gas detection was proposed and demonstrated. The technique involved the use of a thermal-lens detection scheme to monitor thermal emission from the stimulated Raman process. We termed this technique thermal-lens Raman spectroscopy, and it was combined with a novel scheme involving a nonlinear Raman spectroscopy without a tunable laser. This technique was applied to detecting trace hydrogen molecules in the atmosphere by use of a pulsed Nd:YAG laser and a continuous-wave He-Ne probe laser. A detection limit of 9 parts in 10~(6) was attained.
机译:提出并证明了一种新的非线性拉曼光谱技术,用于痕量气体的检测。该技术涉及使用热透镜检测方案来监视受激拉曼过程产生的热辐射。我们将这种技术称为热透镜拉曼光谱,并将其与一种涉及非线性拉曼光谱而无需可调激光器的新颖方案相结合。该技术通过脉冲Nd:YAG激光和连续波He-Ne探针激光被用于检测大气中的痕量氢分子。检出限在10〜(6)中为9。

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