Comparison of femtosecond- and nanosecond-two-photon-absorption laser-induced fluorescence (TALIF) of atomic oxygen in atmospheric-pressure plasmas
Comparison of femtosecond- and nanosecond-two-photon-absorption laser-induced fluorescence (TALIF) of atomic oxygen in atmospheric-pressure plasmas
复制标题
大气压等离子体中原子氧的飞秒和纳秒双光子吸收激光诱导荧光 (TALIF) 的比较
DOI：
10.1088/1361-6595/aa61be
复制
发表时间：
2017
影响因子：
3.8
通讯作者：
Sukesh Roy
中科院分区：
文献类型：
--
作者：
J. Schmidt;B. Sands;J. Scofield;J. Gord;Sukesh Roy
用双光子吸收激光诱导荧光(TALIF)技术测量了纳秒脉冲电场放电产生的原子物种的绝对数密度。这项工作的独特之处在于开发了基于飞秒激光的TALIF(FS-TALIF)，它提供了比更传统的纳秒(Ns)脉冲持续时间激光技术更多的优势，例如在宽压力范围内更高保真地测量猝灭速度，显著减少光解干扰(包括光解和光电离)，在更高的信号电平的帮助下以高空间分辨率收集原子物种数密度的二维图像，以及由于激光的更高重复频率而高效和准确地测量原子物种数密度。为了充分量化这些优势，从大气压等离子体射流中采集了原子氧Talif信号，并对结果进行了比较和对比。
Absolute number densities of atomic species produced by nanosecond (ns)-duration, repetitively pulsed electric discharges are measured by two-photon-absorption laser-induced fluorescence (TALIF). Unique to this work is the development of femtosecond-laser-based TALIF (fs-TALIF) that offers a number of advantages over more conventional nanosecond (ns)-pulse-duration laser techniques, such as higher-fidelity quenching rate measurements over a wide pressure range, significantly reduced photolytic interference (including photo-dissociation and photo-ionization), ability to collect two-dimensional images of atomic-species number densities with high spatial resolution aided by higher signal level, and efficient and accurate measurements of atomic-species number densities due to the higher repetition rates of the laser. For full quantification of these advantages, atomic-oxygen TALIF signals are collected from an atmospheric-pressure plasma jet employing both ns- and fs-duration laser-excitation pulses and the results are compared and contrasted.