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叙述了一种新的激光诊断技术,双光子泵浦加偏振光谱技术的原理、实验方法和实验结果。利用波长为243 nm 的激光,通过双光子泵浦,将 H 原子从基态 1~2S_(1/2)泵浦到亚稳态 2~2S_(1/2),在此基础上,利用偏振光谱技术,测量亚稳态 2~2S_(1/2)的粒子数分布,其结果反映了火焰中 H 原子的浓度分布。实验表明:该技术可以大大提高火焰中氢原子的探测灵敏度,并可实现单次二维测量,为火焰中微量原子 H 的测量提供了一种新的技术手段。
A new laser diagnostic technique, principle, experimental method and experimental results of two-photon pumping plus polarization spectroscopy are described. Using a laser with a wavelength of 243 nm, the H atom is pumped from the ground state of 1 ~ 2S_ (1/2) to the metastable state of 2 ~ 2S_ (1/2) by two-photon pumping. On this basis, Technique to measure the particle number distribution of 2 ~ 2S_ (1/2) in the metastable state. The results reflect the concentration distribution of H atom in the flame. Experiments show that this technique can greatly improve the detection sensitivity of hydrogen atoms in the flame and achieve a single two-dimensional measurement, which provides a new technical measure for the measurement of trace atomic H in the flame.