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首页> 外文期刊>Optics Letters >Hydroxyl radical planar laser-induced fluorescence imaging in flames using frequency-tripled femtosecond laser pulses
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Hydroxyl radical planar laser-induced fluorescence imaging in flames using frequency-tripled femtosecond laser pulses

机译：使用倍增飞倍频激光脉冲的火焰激光诱导羟基自由基平面激光诱导荧光成像

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摘要

Ultra-short optical pulses in the ultraviolet (UV) region are of significant interest for combustion and reacting flow diagnostics, as most important chemical species have electronic resonance transitions in the UV region. Optical parametric amplifiers are typically used for frequency conversion of femtosecond (fs) pulses from near-IR to UV; however, their implementation for practical imaging applications is limited because of the low conversion efficiency and extreme sensitivity to ambient conditions. In this work, we report the implementation of direct-frequency-tripled, fs laser pulses from a tunable amplified laser system for high-resolution imaging of hydroxyl (OH) radical in flames. The fundamental laser output near 850 nm is frequency tripled to obtain approximately 283.3-nm UV radiation. OH planar laser-induced fluorescence (PLIF) imaging at 1 kHz is demonstrated in turbulent flames with image sheet heights in excess of 45 mm and a signal-to-noise ratio better than 25. These results represent over 3 x increase in the imaging dimensionality compared to traditional OPA-based systems. Additionally, the third-harmonic generation apparatus is compact, robust, and easy to operate while providing near-Gaussian beam profiles. Simple power scaling suggests another factor of 3 or more increase in sheet height can be achieved for kilohertz-rate practical combustion diagnostics applications. (C) 2020 Optical Society of America
机译：紫外线（UV）区域中的超短光学脉冲对燃烧和反应流动诊断具有重要兴趣，因为最重要的化学物质具有UV区域中的电子共振转变。光学参数放大器通常用于近IR到UV的飞秒（FS）脉冲的频率转换;然而，由于对环境条件的转换效率低和极端敏感性，它们对实际成像应用的实现是有限的。在这项工作中，我们报告了从可调谐放大激光系统的直接倍增的FS激光脉冲的实现，用于在火焰中的羟基（OH）自由基的高分辨率成像。在850nm附近的基本激光输出是频率增加三倍，以获得约283.3nm uV辐射。 OH平面激光诱导的荧光（PLIF）在1 kHz上成像在湍流的火焰中，图像板高度超过45mm，并且信噪比优于25.这些结果表示成像维度的3倍增加增加与传统的基于OPA的系统相比。另外，第三谐波产生装置紧凑，稳健，易于操作，同时提供近高斯光束轮廓。简单的功率缩放表明，对于千赫兹速率实用的燃烧诊断应用，可以实现纸张高度增加3或更多倍数。 （c）2020美国光学学会

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