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首页> 外文期刊>Applied Optics >Comparison of nanosecond and picosecond excitation for two-photon laser-induced fluorescence imaging of atomic oxygen in flames
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Comparison of nanosecond and picosecond excitation for two-photon laser-induced fluorescence imaging of atomic oxygen in flames

机译：纳秒和皮秒激发对火焰中原子氧的双光子激光诱导荧光成像的比较

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摘要

Two-photon laser-induced fluorescence (LIF) imaging of atomic oxygen is investigated in premixed hydrogen and methane flames with nanosecond and picosecond pulsed lasers at 226 nm. In the hydrogen flame, the interference from photolysis is negligible compared with the LIF signal from native atomic oxygen, and the major limitations on quantitative measurements are stimulated emission and photoionization. Excitation with a nanosecond laser is advantageous in the hydrogen flames, because it reduces the effects of stimulated emission and photoionization. In the methane flames, however, photolytic interference is the major complication for quantitative O-atom measurements. A comparison of methane and hydrogen flames indicates that vibrationally excited CO_(2) is the dominant precursor for laser-generated atomic oxygen. In the methane flames, picosecond excitation offers a significant advantage by dramatically reducing the photolytic interference. The prospects for improved O-atom imaging in hydrogen and hydrocarbon flames are presented.
机译：在226 nm的纳秒和皮秒脉冲激光下，在预混合的氢气和甲烷火焰中研究了原子氧的双光子激光诱导荧光（LIF）成像。在氢火焰中，与来自天然原子氧的LIF信号相比，来自光解的干扰可以忽略不计，并且定量测量的主要限制是受激发射和光电离。纳秒激光激发在氢火焰中是有利的，因为它减少了受激发射和光电离的影响。然而，在甲烷火焰中，光解干扰是定量O原子测量的主要复杂因素。甲烷和氢气火焰的比较表明，振动激发的CO_（2）是激光产生的原子氧的主要前体。在甲烷火焰中，皮秒激发通过显着降低光解干扰提供了显着的优势。提出了改进氢和碳氢化合物火焰中O原子成像的前景。

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