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首页> 外文会议>Advanced Environmental, Chemical, and Biological Sensing Technologies II >Sub-Doppler high-resolution wave-mixing detection method for isotopes in environmental applications
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Sub-Doppler high-resolution wave-mixing detection method for isotopes in environmental applications

机译：环境应用中同位素的亚多普勒高分辨率混波检测方法

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摘要

Sub-Doppler laser wave-mixing spectroscopy is presented as a sensitive and high-resolution optical method for measuring isotopes and hyperfine structures. By fingerprinting isotopes at sensitive levels, one can track biohazardous pollutants in various environmental samples since isotope and hyperfine profiles are unique and characteristic of specific locations and sources including those for heavy metal contaminants and chemical runoff. We present an unusually sensitive optical absorption method that offers isotope specificity and resolution at excellent detection sensitivity levels. Sub-Doppler laser wave-mixing spectroscopy is a resonant nonlinear optical technique which uses three intersecting laser beams to produce a signal beam that has all the coherent properties of the original input laser beams. This laser-like signal beam can be efficiently directed, collected, filtered and detected. The use of counter-propagating input beams minimizes Doppler broadening and the resulting sub-Doppler spectral resolution is suitable for isotope and hyperfine splitting measurements. This relatively simple absorption-based method offers better sensitivity and selectivity levels and it requires minimum sample preparation steps.
机译：亚多普勒激光波混合光谱法是一种用于测量同位素和超精细结构的灵敏且高分辨率的光学方法。通过在敏感水平上对同位素进行指纹识别，人们可以追踪各种环境样品中的生物危害污染物，因为同位素和超精细剖面是独特的，并且是特定位置和来源（包括重金属污染物和化学径流）的特征。我们提出了一种异常灵敏的光吸收方法，该方法以出色的检测灵敏度水平提供了同位素特异性和分辨率。亚多普勒激光波混合光谱法是一种共振非线性光学技术，它使用三个相交的激光束产生具有原始输入激光束所有相干特性的信号束。这种类似激光的信号束可以被有效地引导，收集，过滤和检测。反向传播的输入光束的使用使多普勒展宽减至最小，并且产生的亚多普勒光谱分辨率适合于同位素和超精细分裂测量。这种相对简单的基于吸收的方法可提供更好的灵敏度和选择性，并且需要最少的样品制备步骤。

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